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Astrology consists of several systems of divination1 based on the premise that there is a relationship between astronomical phenomena and events in the human world. Many cultures have attached importance to astronomical events, and the Indians, Chinese, and Mayans developed elaborate systems for predicting terrestrial events from celestial observations. In the West, astrology most often consists of a system of horoscopes purporting to explain aspects of a person's personality and predict future events in their life based on the positions of the sun, moon, and other celestial objects at the time of their birth. The majority of professional astrologers rely on such systems.2:83
Throughout most of its history, astrology was considered a scholarly tradition. It was accepted in political and academic contexts, and was connected with other studies, such as astronomy, alchemy, meteorology, and medicine.3 At the end of the 17th century, new scientific concepts in astronomy and physics (such as heliocentrism and Newtonian mechanics) called astrology into question. Astrology thus lost its academic and theoretical standing, and common belief in astrology has largely declined.4 Astrology has been rejected by the scientific community as a pseudoscience, having no validity or explanatory power for describing the universe. Among other issues, there is no proposed mechanism of action by which the positions and motions of stars and planets could affect people and events on Earth that does not contradict well understood basic aspects of biology and physics.5:2496 Scientific testing of astrology has found no evidence to support any of the premises or purported effects outlined in astrological traditions. In one study, participating astrologers attempting to match natal charts with profiles generated by a psychological inventory produced results not significantly at variance with random chance.7:424
Astrology has been dated to at least the 2nd millennium BCE, with roots in calendrical systems used to predict seasonal shifts and to interpret celestial cycles as signs of divine communications.8 A form of astrology was practised in the first dynasty of Mesopotamia (1950–1651 BCE). Chinese astrology was elaborated in the Zhou dynasty (1046–256 BCE). Hellenistic astrology after 332 BCE mixed Babylonian astrology with Egyptian Decanic astrology in Alexandria, creating horoscopic astrology. Alexander the Great's conquest of Asia allowed astrology to spread to Ancient Greece and Rome. In Rome, astrology was associated with "Chaldean wisdom". After the conquest of Alexandria in the 7th century, astrology was taken up by Islamic scholars, and Hellenistic texts were translated into Arabic and Persian. In the 12th century, Arabic texts were imported to Europe and translated into Latin, helping to initiate the European Renaissance, when major astronomers including Tycho Brahe, Johannes Kepler and Galileo practised as court astrologers. Astrological references appear in literature in the works of poets such as Dante Alighieri and Geoffrey Chaucer, and of playwrights such as Christopher Marlowe and William Shakespeare.
- 1 Etymology
- 2 History
- 3 Principles and practice
- 4 Theological viewpoints
- 5 Scientific analysis and criticism
- 6 Cultural impact
- 7 See also
- 8 Notes
- 9 References
- 10 Sources
- 11 Further reading
- 12 External links
The word astrology comes from the early Latin word astrologia,9 deriving from the Greek ἀστρολογία (from ἄστρον astron, "star" and -λογία -logia, "study of"), "account of the stars". Astrologia later passed into meaning 'star-divination' with astronomia used for the scientific term.10
Many cultures have attached importance to astronomical events, and the Indians, Chinese, and Mayans developed elaborate systems for predicting terrestrial events from celestial observations. In the West, astrology most often consists of a system of horoscopes purporting to explain aspects of a person's personality and predict future events in their life based on the positions of the sun, moon, and other celestial objects at the time of their birth. The majority of professional astrologers rely on such systems.2:83
Astrology has been dated to at least the 2nd millennium BCE, with roots in calendrical systems used to predict seasonal shifts and to interpret celestial cycles as signs of divine communications.8 A form of astrology was practised in the first dynasty of Mesopotamia (1950–1651 BCE). Chinese astrology was elaborated in the Zhou dynasty (1046–256 BCE). Hellenistic astrology after 332 BCE mixed Babylonian astrology with Egyptian Decanic astrology in Alexandria, creating horoscopic astrology. Alexander the Great's conquest of Asia allowed astrology to spread to Ancient Greece and Rome. In Rome, astrology was associated with 'Chaldean wisdom'. After the conquest of Alexandria in the 7th century, astrology was taken up by Islamic scholars, and Hellenistic texts were translated into Arabic and Persian. In the 12th century, Arabic texts were imported to Europe and translated into Latin, helping to initiate the European Renaissance, when major astronomers including Tycho Brahe, Johannes Kepler and Galileo practised as court astrologers. Astrological references appear in literature in the works of poets such as Dante Alighieri and Geoffrey Chaucer, and of playwrights such as Christopher Marlowe and William Shakespeare.
Throughout most of its history, astrology was considered a scholarly tradition. It was accepted in political and academic contexts, and was connected with other studies, such as astronomy, alchemy, meteorology, and medicine.3 At the end of the 17th century, new scientific concepts in astronomy and physics (such as heliocentrism and Newtonian mechanics) called astrology into question. Astrology thus lost its academic and theoretical standing, and common belief in astrology has largely declined.4
Astrology, in its broadest sense, is the search for meaning in the sky.11:2,3 Early evidence for humans making conscious attempts to measure, record, and predict seasonal changes by reference to astronomical cycles, appears as markings on bones and cave walls, which show that lunar cycles were being noted as early as 25,000 years ago.12:81ff This was a first step towards recording the Moon's influence upon tides and rivers, and towards organizing a communal calendar.12 Agricultural needs were addressed with increasing knowledge of constellations which appear in the different seasons, allowing the rising of particular star-groups to herald annual floods or seasonal activities.13 By the 3rd millennium BCE, civilizations had sophisticated awareness of celestial cycles, and may have oriented temples in alignment with heliacal risings of the stars.14
There is scattered evidence to suggest that the oldest known astrological references are copies of texts made in the ancient world. The Venus tablet of Ammisaduqa (compiled in Babylon around 1700 BCE) is reported to have been made during the reign of king Sargon of Akkad (2334–2279 BCE).15 A scroll documenting an early use of electional astrology is doubtfully ascribed to the reign of the Sumerian ruler Gudea of Lagash (c. 2144 – 2124 BCE). This describes how the gods revealed to him in a dream the constellations that would be most favourable for the planned construction of a temple.16 However, there is controversy about whether these were genuinely recorded at the time or merely ascribed to ancient rulers by posterity. The oldest undisputed evidence of the use of astrology as an integrated system of knowledge is therefore attributed to the records of the first dynasty of Mesopotamia (1950–1651 BCE). This astrology had some parallels with Hellenistic Greek (western) astrology, including the zodiac, a norming point near 9 degrees in Aries, the trine aspect, planetary exaltations, and the dodekatemoria (the twelve divisions of 30 degrees each).17 However, the Babylonians viewed celestial events as possible signs rather than as causes of physical events.17
The system of Chinese astrology was elaborated during the Zhou dynasty (1046–256 BCE) and flourished during the Han Dynasty (2nd century BCE to 2nd century CE), during which all the familiar elements of traditional Chinese culture – the Yin-Yang philosophy, theory of the five elements, Heaven and Earth, Confucian morality – were brought together to formalise the philosophical principles of Chinese medicine and divination, astrology and alchemy.18:3,4
Cicero stated the twins objection (that with close birth times, personal outcomes can be very different), later developed by Saint Augustine.19 He argued that since the other planets are much more distant from the earth than the moon, they could have only very tiny influence compared to the moon's.20 He also argued that if astrology explains everything about a person's fate, then it wrongly ignores the visible effect of inherited ability and parenting, changes in health worked by medicine, or the effects of the weather on people.21
Plotinus argued that since the fixed stars are much more distant than the planets, it is laughable to imagine the planets' effect on mankind should depend on their position with respect to the zodiac. He also argues that the interpretation of the moon's conjunction with a planet as good when the moon is full, but bad when the moon is waning, is clearly wrong, as from the moon's point of view, half of her surface is always in sunlight; and from the planet's point of view, waning should be better, as then the planet sees some light from the moon, but when the moon is full to us, it is dark, and therefore bad, on the side facing the planet.22
Favorinus argued that it was absurd to imagine that stars and planets would affect human bodies in the same way as they affect the tides,23 and equally absurd that small motions in the heavens cause large changes in people's fates. Sextus Empiricus argued that it was absurd to link human attributes with myths about the signs of the zodiac.24 Carneades argued that belief in fate denies free will and morality; that people born at different times can all die in the same accident or battle; and that contrary to uniform influences from the stars, tribes and cultures are all different.25
With the occupation by Alexander the Great in 332 BCE, Egypt became Hellenistic. The city of Alexandria was founded by Alexander after the conquest, becoming the place where Babylonian astrology was mixed with Egyptian Decanic astrology to create Horoscopic astrology. This contained the Babylonian zodiac with its system of planetary exaltations, the triplicities of the signs and the importance of eclipses. It used the Egyptian concept of dividing the zodiac into thirty-six decans of ten degrees each, with an emphasis on the rising decan, and the Greek system of planetary Gods, sign rulership and four elements.27 2nd century BCE texts predict positions of planets in zodiac signs at the time of the rising of certain decans, particularly Sothis.28 The astrologer and astronomer Ptolemy lived in Alexandria. Ptolemy's work the Tetrabiblos formed the basis of Western astrology, and "enjoyed almost the authority of a Bible among the astrological writers of a thousand years or more".29
The conquest of Asia by Alexander the Great exposed the Greeks to ideas from Syria, Babylon, Persia and central Asia.30 Around 280 BCE, Berossus, a priest of Bel from Babylon, moved to the Greek island of Kos, teaching astrology and Babylonian culture.31 By the 1st century BCE, there were two varieties of astrology, one using horoscopes to describe the past, present and future; the other, theurgic, emphasising the soul's ascent to the stars.32 Greek influence played a crucial role in the transmission of astrological theory to Rome.33
The first definite reference to astrology in Rome comes from the orator Cato, who in 160 BCE warned farm overseers against consulting with Chaldeans,34 who were described as Babylonian 'star-gazers'.35 Among both Greeks and Romans, Babylonia (also known as Chaldea) became so identified with astrology that 'Chaldean wisdom' became synonymous with divination using planets and stars.36 The 2nd-century Roman poet and satirist Juvenal complains about the pervasive influence of Chaldeans, saying "Still more trusted are the Chaldaeans; every word uttered by the astrologer they will believe has come from Hammon's fountain".37
One of the first astrologers to bring Hermetic astrology to Rome was Thrasyllus, astrologer to the emperor Tiberius,33 the first emperor to have had a court astrologer,38 though his predecessor Augustus had used astrology to help legitimise his Imperial rights.39
Astrology was taken up by Islamic scholars following the collapse of Alexandria to the Arabs in the 7th century, and the founding of the Abbasid empire in the 8th. The second Abbasid caliph, Al Mansur (754–775) founded the city of Baghdad to act as a centre of learning, and included in its design a library-translation centre known as Bayt al-Hikma 'House of Wisdom', which continued to receive development from his heirs and was to provide a major impetus for Arabic-Persian translations of Hellenistic astrological texts. The early translators included Mashallah, who helped to elect the time for the foundation of Baghdad,40 and Sahl ibn Bishr, (a.k.a. Zael), whose texts were directly influential upon later European astrologers such as Guido Bonatti in the 13th century, and William Lilly in the 17th century.41 Knowledge of Arabic texts started to become imported into Europe during the Latin translations of the 12th century, the effect of which was to help initiate the European Renaissance.
The first astrological book published in Europe was the Liber Planetis et Mundi Climatibus ("Book of the Planets and Regions of the World") which appeared between 1010 and 1027 AD, and may have been authored by Gerbert of Aurillac.42 Ptolemy's second century AD Tetrabiblos was translated into Latin by Plato of Tivoli in 1138.42 The Dominican theologian Thomas Aquinas followed Aristotle in proposing that the stars ruled the imperfect 'sublunary' body, while attempting to reconcile astrology with Christianity by stating that God ruled the soul.43 The thirteenth century mathematician Campanus of Novara is said to have devised a system of astrological houses which divides the prime vertical into 'houses' of equal 30° arcs,44 though the system was used earlier in the East.45 The thirteenth century astronomer Guido Bonatti wrote a textbook, the Liber Astronomicus, a copy of which was owned at the end of the fifteenth century by king Henry VII of England.44
In Paradiso, the final part of the Divine Comedy, the Italian poet Dante Alighieri referred "in countless details"46 to the astrological planets, though he adapted traditional astrology to suit his Christian viewpoint,46 for example using astrological thinking in his prophecies of the reform of Christendom.47
In the seventh century, Isidore of Seville argued in his Etymologiae that astronomy described the movements of the heavens, while astrology had two parts: one was scientific, describing the movements of the sun, the moon and the stars, while the other, making predictions, was theologically erroneous.4849 In contrast, John Gower in the fourteenth century defined astrology as essentially limited to the making of predictions.4850 The influence of the stars was in turn divided into natural astrology, with for example effects on tides and the growth of plants, and judicial astrology, with supposedly predictable effects on people.5152 The fourteenth century skeptic Nicole Oresme however included astronomy as a part of astrology in his Livre de divinacions.53 Oresme argued that current approaches to prediction of events such as plagues, wars, and weather were inappropriate, but that such prediction was a valid field of inquiry. However, he attacked the use of astrology to choose the timing of actions (so-called interrogation and election) as wholly false, and rejected the determination of human action by the stars on grounds of free will.5354 The friar Laurens Pignon (c. 1368–1449)55 similarly rejected all forms of divination and determinism, including by the stars, in his 1411 Contre les Devineurs.56 This was in opposition to the tradition carried by the Arab astronomer Albumasar (787-886) whose Introductorium in Astronomiam and De Magnis Coniunctionibus argued the view that both individual actions and larger scale history are determined by the stars.57
Renaissance scholars often practised astrology to pay for their research into other subjects.58 Gerolamo Cardano cast the horoscope of king Edward VI of England, while John Dee was the personal astrologer to queen Elizabeth I of England.58 Catherine de Medici paid Michael Nostradamus in 1566 to verify the prediction of the death of her husband, king Henry II of France made by her astrologer Lucus Gauricus.58 Major astronomers who practised as court astrologers included Tycho Brahe in the royal court of Denmark, Johannes Kepler to the Habsburgs and Galileo Galilei to the Medici.58 The astronomer and spiritual astrologer Giordano Bruno was burnt at the stake for heresy in Rome in 1600.58
Ephemerides with complex astrological calculations, and almanacs interpreting celestial events for use in medicine and for choosing times to plant crops, were popular in Elizabethan England.59 In 1597, the English mathematician and physician Thomas Hood made a set of paper instruments using revolving overlays which enabled students to work out relationships between the fixed stars or constellations, the midheaven, and the twelve astrological houses.60 Hood's instruments also illustrated for pedagogical purposes the supposed relationships between the signs of the zodiac, the planets, and the parts of the human body which were believed to be governed by the planets and signs.6061 While Hood's presentation was innovative, his astrological information was largely standard and was taken from Gerard Mercator's astrological disc made in 1551, or a source used by Mercator.6263
English astrology had reached its zenith by the 17th century.64 Astrologers were theorists, researchers, and social engineers, as well as providing individual advice to everyone from monarchs downwards. Among other things, astrologers could advise on the best time to take a journey or harvest a crop, diagnose and prescribe for physical or mental illnesses, and predict natural disasters. This underpinned a system in which everything - people, the world, the universe - was understood to be interconnected, and astrology co-existed happily with religion, magic and science.65
During The Enlightenment, intellectual sympathy for astrology fell away, leaving only a popular following supported by cheap almanacs.66 One English almanac compiler, Richard Saunders, followed the spirit of the age by printing a derisive Discourse on the Invalidity of Astrology, while in France Pierre Bayle's Dictionnaire of 1697 stated that the subject was puerile.66 The Anglo-Irish satirist Jonathan Swift ridiculed the Whig political astrologer John Partridge.66
Astrology saw a popular revival starting in the 19th century as part of a general revival of spiritualism and later New Age philosophy,67:239–249 and through the influence of mass media such as newspaper horoscopes.67:259–263 Early in the 20th century the psychiatrist Carl Jung developed some concepts concerning astrology,68 which led to the development of psychological astrology.67:251–2566970
Advocates have defined astrology as a symbolic language, an art form, a science, and a method of divination.7172 Although most cultural systems of astrology share common roots in ancient philosophies that influenced each other, many have unique methodologies which differ from those developed in the West. These include Hindu astrology (also known as "Indian astrology" and in modern times referred to as "Vedic astrology") and Chinese astrology, both of which have influenced the world's cultural history.
Western astrology is a form of divination based on the construction of a horoscope for an exact moment, such as a person's birth.73 It uses the tropical zodiac, which is aligned to the equinoctial points.74
Western astrology is founded on the movements and relative positions of celestial bodies such as the Sun, Moon and planets, which are analyzed by their movement through signs of the zodiac (twelve spatial divisions of the ecliptic) and by their aspects (based on geometric angles) relative to one another. They are also considered by their placement in houses (twelve spatial divisions of the sky).75 Astrology's modern representation in western popular media is usually reduced to sun sign astrology, which considers only the zodiac sign of the Sun at an individual's date of birth, and represents only 1/12 of the total chart.76
The horoscope visually expresses the set of relationships for the time and place of the chosen event. These relationships are between the seven 'planets', signifying tendencies such as war and love; the twelve signs of the zodiac; and the twelve houses. Each planet is in a particular sign and a particular house at the chosen time, when observed from the chosen place, creating two kinds of relationship.77 A third kind is the aspect of each planet to every other planet, where for example two planets 120° apart (in 'trine') are in a harmonious relationship, but two planets 90° apart ('square') are in a conflicted relationship.7879 Together these relationships and their interpretations supposedly form "the language of the heavens speaking to learned men".77
Along with tarot divination, astrology is one of the core studies of Western esotericism, and as such has influenced systems of magical belief not only among Western esotericists and Hermeticists, but also belief systems such as Wicca that have borrowed from or been influenced by the Western esoteric tradition. Tanya Luhrmann has said that "all magicians know something about astrology," and refers to a table of correspondences in Starhawk's The Spiral Dance, organized by planet, as an example of the astrological lore studied by magicians.80
Hindu natal astrology originated with Hellenistic astrology by the 3rd century BCE,82:36183 though incorporating the Hindu lunar mansions.84 The names of the signs (e.g. Greek 'Kpios' for Aries, Hindi 'Kriya'), the planets (e.g. Greek 'Helios' for Sun, astrological Hindi 'Heli'), and astrological terms (e.g. Greek 'apoklima' and 'sunaphe' for declination and planetary conjunction, Hindi 'apoklima' and 'sunapha' respectively) in Varaha Mihira's texts are considered conclusive evidence of a Greek origin for Hindu astrology.85 The Indian techniques may also have been augmented with some of the Babylonian techniques.86:231
Chinese astrology has a close relation with Chinese philosophy (theory of the three harmonies: heaven, earth and man) and uses concepts such as yin and yang, the Five phases, the 10 Celestial stems, the 12 Earthly Branches, and shichen (時辰 a form of timekeeping used for religious purposes). The early use of Chinese astrology was mainly confined to political astrology, the observation of unusual phenomena, identification of portents and the selection of auspicious days for events and decisions.18:22,85,176
The constellations of the Zodiac of western Asia and Europe were not used; instead the sky is divided into Three Enclosures (三垣 sān yuán), and Twenty-eight Mansions (二十八宿 èrshíbā xiù) in twelve Ci (十二次).87 The Chinese zodiac of twelve animal signs is said to represent twelve different types of personality. It is based on cycles of years, lunar months, and two-hour periods of the day (the shichen). The zodiac traditionally begins with the sign of the Rat, and the cycle proceeds through 11 other animals signs: the Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog and Pig.88 Complex systems of predicting fate and destiny based on one's birthday, birth season, and birth hours, such as ziping and Zi Wei Dou Shu (simplified Chinese: 紫微斗数; traditional Chinese: 紫微斗數; pinyin: zǐwēidǒushù) are still used regularly in modern day Chinese astrology. They do not rely on direct observations of the stars.89
The Korean zodiac is identical to the Chinese one. The Vietnamese zodiac is almost identical to Chinese zodiac except the second animal is the Water Buffalo instead of the Ox, and the fourth animal is the Cat instead of the Rabbit. The Japanese have since 1873 celebrated the beginning of the new year on 1 January as per the Gregorian Calendar. The Thai zodiac begins, not at Chinese New Year, but either on the first day of fifth month in the Thai lunar calendar, or during the Songkran festival (now celebrated every 13–15 April), depending on the purpose of the use.90
St. Augustine (354-430) believed that the determinism of astrology conflicted with the Christian doctrines of man's free will and responsibility, and God not being the cause of evil,91 but he also grounded his opposition philosophically, citing the failure of astrology to explain twins who behave differently although conceived at the same moment and born at approximately the same time.92
Some of the practices of astrology were contested on theological grounds by medieval Muslim astronomers such as Al-Farabi (Alpharabius), Ibn al-Haytham (Alhazen) and Avicenna. They said that the methods of astrologers conflicted with orthodox religious views of Islamic scholars, by suggesting that the Will of God can be known and predicted in advance.93 For example, Avicenna's 'Refutation against astrology', Risāla fī ibṭāl aḥkām al-nojūm, argues against the practice of astrology while supporting the principle that planets may act as agents of divine causation. Avicenna considered that the movement of the planets influenced life on earth in a deterministic way, but argued against the possibility of determining the exact influence of the stars.94 Essentially, Avicenna did not deny the core dogma of astrology, but denied our ability to understand it to the extent that precise and fatalistic predictions could be made from it.95 Ibn Qayyim Al-Jawziyya (1292–1350), in his Miftah Dar al-SaCadah, also used physical arguments in astronomy to question the practice of judicial astrology.96 He recognized that the stars are much larger than the planets, and argued:
And if you astrologers answer that it is precisely because of this distance and smallness that their influences are negligible, then why is it that you claim a great influence for the smallest heavenly body, Mercury? Why is it that you have given an influence to al-Ra's and al-Dhanab, which are two imaginary points [ascending and descending nodes]?—Ibn Qayyim Al-Jawziyya96
All forms of divination are to be rejected: recourse to Satan or demons, conjuring up the dead or other practices falsely supposed to "unveil" the future. Consulting horoscopes, astrology, palm reading, interpretation of omens and lots, the phenomena of clairvoyance, and recourse to mediums all conceal a desire for power over time, history, and, in the last analysis, other human beings, as well as a wish to conciliate hidden powers. They contradict the honor, respect, and loving fear that we owe to God alone.98—Catechism of the Catholic Church
Astrology has been rejected by the scientific community as having no explanatory power for describing the universe and is considered a pseudoscience.99100101:1350 Scientific testing of astrology has been conducted, and no evidence has been found to support any of the premises or purported effects outlined in astrological traditions.7:424 There is no proposed mechanism of action by which the positions and motions of stars and planets could affect people and events on Earth that does not contradict well understood, basic aspects of biology and physics.5:2496 Those who continue to have faith in astrology have been characterized as doing so "in spite of the fact that there is no verified scientific basis for their beliefs, and indeed that there is strong evidence to the contrary".102
It has also been shown that confirmation bias is a psychological factor that contributes to belief in astrology.103:344104:180–181105:42–48 Confirmation bias is a form of cognitive bias.a106:553 According to available literature Astrology believers tend to selectively remember those predictions which have turned out to be true, and do not remember those predictions which happen to be false. Another, separate, form of confirmation bias also plays a role, where believers often fail to distinguish between messages that demonstrate special ability and those which do not.104:180–181 Thus there are two distinct forms of confirmation bias that are under study with respect to astrological belief.104:180–181
Under the criterion of falsifiability, first proposed by philosopher of science Karl Popper, astrology is a pseudoscience.107 Popper regarded astrology as "pseudo-empirical" in that "it appeals to observation and experiment", but "nevertheless does not come up to scientific standards".108:44 In contrast to scientific disciplines, astrology has not responded to falsification through experiment.109:206 In contrast to Popper, the philosopher Thomas Kuhn argued that it was not lack of falsifiability that makes astrology unscientific, but rather that the process and concepts of astrology are non-empirical.110:401
To Kuhn, although astrologers had, historically, made predictions that "categorically failed", this in itself does not make it unscientific, nor do the attempts by astrologers to explain away the failure by claiming it was due to the creation of a horoscope being very difficult. Rather, in Kuhn's eyes, astrology is not science because it was always more akin to medieval medicine; they followed a sequence of rules and guidelines for a seemingly necessary field with known shortcomings, but they did no research because the fields are not amenable to research,111:8 and so "they had no puzzles to solve and therefore no science to practise".110:401111:8 While an astronomer could correct for failure, an astrologer could not. An astrologer could only explain away failure but could not revise the astrological hypothesis in a meaningful way. As such, to Kuhn, even if the stars could influence the path of humans through life astrology is not scientific.111:8
Philosopher Paul Thagard believed that astrology cannot be regarded as falsified in this sense until it has been replaced with a successor. In the case of predicting behaviour, psychology is the alternative.112:228 To Thagard a further criterion of demarcation of science from pseudoscience was that the state-of-the-art must progress and that the community of researchers should be attempting to compare the current theory to alternatives, and not be "selective in considering confirmations and disconfirmations".112:227–228 Progress is defined here as explaining new phenomena and solving existing problems, yet astrology has failed to progress having only changed little in nearly 2000 years.112:228113:549 To Thagard, astrologers are acting as though engaged in Normal science believing that the foundations of astrology were well established despite the "many unsolved problems", and in the face of better alternative theories (Psychology). For these reasons Thagard viewed astrology as pseudoscience.112113:228
For the philosopher Edward W. James, astrology is irrational not because of the numerous problems with mechanisms and falsification due to experiments, but because an analysis of the astrological literature shows that it is infused with fallacious logic and poor reasoning.114:34
What if throughout astrological writings we meet little appreciation of coherence, blatant insensitivity to evidence, no sense of a hierarchy of reasons, slight command over the contextual force of critieria, stubborn unwillingless to pursue an argument where it leads, stark naivete concerning the effiacacy of explanation and so on? In that case, I think, we are perfectly justified in rejecting astrology as irrational. ... Astrology simply fails to meet the multifarious demands of legitimate reasoning."—Edward W. James114:34
Astrology has not demonstrated its effectiveness in controlled studies and has no scientific validity.2:857 Where it has made falsifiable predictions under controlled conditions, they have been falsified.7:424 One famous experiment included 28 astrologers who were asked to match over a hundred natal charts to psychological profiles generated by the California Psychological Inventory (CPI) questionnaire.115116 The double-blind experimental protocol used in this study was agreed upon by a group of physicists and a group of astrologers7 nominated by the National Council for Geocosmic Research, who advised the experimenters, helped ensure that the test was fair116:117117:420 and helped draw the central proposition of natal astrology to be tested.117:419 They also chose 26 out of the 28 eight astrologers for the tests (two more volunteered afterwards).117:420 The study, published in Nature in 1985, found that predictions based on natal astrology were no better than chance, and that the testing "clearly refutes the astrological hypothesis".117
In 1955, astrologer and psychologist Michel Gauquelin stated that although he had failed to find evidence to support such indicators as the zodiacal signs and planetary aspects in astrology, he had found positive correlations between the diurnal positions of some of the planets and success in some professions which astrology traditionally associates with those planets.118119 The best-known of Gauquelin's findings is based on the positions of Mars in the natal charts of successful athletes and became known as the "Mars effect".120:213 A study conducted by seven French scientists attempted to replicate the claim, but found no statistical evidence.120:213–214 They attributed the effect to selective bias on Gauquelin's part, accusing him of attempting to persuade them to add or delete names from their study.121
Geoffrey Dean has suggested that the effect may be caused by self-reporting of birth dates by parents rather than any issue with the study by Gauquelin. The suggestion is that a small subset of the parents may have had changed birth times to be consistent with better astrological charts for a related profession. The sample group was taken from a time where belief in astrology was more common. Gauquelin had failed to find the Mars effect in more recent populations, where a nurse or doctor recorded the birth information. The number of births under astrologically undesirable conditions was also lower, indicating more evidence that parents choose dates and times to suit their beliefs.116:116
Dean, a scientist and former astrologer, and psychologist Ivan Kelly conducted a large scale scientific test, involving more than one hundred cognitive, behavioural, physical and other variables, but found no support for astrology.122123 Furthermore, a meta-analysis was conducted pooling 40 studies consisting of 700 astrologers and over 1,000 birth charts. Ten of the tests, which had a total of 300 participating, involved the astrologers picking the correct chart interpretation out of a number of others which were not the astrologically correct chart interpretation (usually 3 to 5 others). When the date and other obvious clues were removed no significant results were found to suggest there was any preferred chart.123:190
Testing the validity of astrology can be difficult because there is no consensus amongst astrologers as to what astrology is or what it can predict.2:83 Most professional astrologers are paid to predict the future or describe a person's personality and life, but most horoscopes only make vague untestable statements that can apply to almost anyone.2105:83
Many astrologers claim that astrology is scientific,124 while some have proposed conventional causal agents such as electromagnetism and gravity.124125 Scientists reject these mechanisms as implausible124 since, for example, the magnetic field, when measured from earth, of a large but distant planet such as Jupiter is far smaller than that produced by ordinary household appliances.125126
Western astrology has taken the earth's axial precession (also called precession of the equinoxes) into account since Ptolemy's Almagest, so the 'first point of Aries', the start of the astrological year, continually moves against the background of the stars.127 The tropical zodiac has no connection to the stars, and as long as no claims are made that the constellations themselves are in the associated sign, astrologers avoid the concept that precession seemingly moves the constellations.128 Charpak and Broch, noting this, referred to astrology based on the tropical zodiac as being "...empty boxes that have nothing to do with anything and are devoid of any consistency or correspondence with the stars."128 Sole use of the tropical zodiac is inconsistent with references made, by the same astrologers, to the Age of Aquarius, which depends on when the vernal point enters the constellation of Aquarius.7
Astrologers usually have only a small knowledge of astronomy and they often do not take into account basic features such as the precession of the equinoxes which would change the position of the sun with time; they commented on the example of Elizabeth Teissier who claimed that "the sun ends up in the same place in the sky on the same date each year" as the basis for claims that two people with the same birthday but a number of years apart should be under the same planetary influence. Charpak and Broch noted that "there is a difference of about twenty-two thousand miles between Earth's location on any specific date in two successive years" and that thus they should not be under the same influence according to astrology. Over a 40 years period there would be a difference greater than 780,000 miles.128:6–7
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In the West, political leaders have sometimes consulted astrologers. Louis de Wohl worked as an astrologer for the British intelligence agency MI5, after it was claimed that Adolf Hitler used astrology to time his actions. The War Office was "interested to know what Hitler's own astrologers would be telling him from week to week".129 In fact, de Wohl's predictions were so inaccurate that he was soon labelled a "complete charlatan" and it was later shown that Hitler considered astrology to be "complete nonsense".130 After John Hinckley's attempted assassination of U.S. President Ronald Reagan, first lady Nancy Reagan commissioned astrologer Joan Quigley to act as the secret White House astrologer. However, Quigley's role ended in 1988 when it became public through the memoirs of former chief of staff, Donald Regan.131
There was a boom in interest in astrology in the late 1960s. The sociologist Marcello Truzzi described three levels of involvement of "Astrology-believers" to account for its revived popularity in the face of scientific discrediting. He found that most astrology-believers did not claim it was a scientific explanation with predictive power. Instead, those superficially involved, knowing "next to nothing" about astrology's 'mechanics', read newspaper astrology columns, and could benefit from "tension-management of anxieties" and "a cognitive belief-system that transcends science".132 Those at the second level usually had their horoscopes cast and sought advice and predictions. They were much younger than those at the first level, and could benefit from knowledge of the language of astrology and the resulting ability to belong to a coherent and exclusive group. Those at the third level were highly involved and usually cast horoscopes for themselves. Astrology provided this small minority of astrology-believers with a "meaningful view of their universe and [gave] them an understanding of their place in it."b This third group took astrology seriously, possibly as a "sacred canopy", whereas the other two groups took it playfully and irreverently.132
In 1953, sociologist Theodor W. Adorno conducted a study of the astrology column of a Los Angeles newspaper as part of a project examining mass culture in capitalist society.133:326 Adorno believed that popular astrology, as a device, invariably led to statements which encouraged conformity, and that astrologers who went against conformity with statement discouraging performance at work etc. would risk losing their jobs.133:327 Adorno concluded that astrology was a large-scale manifestation of systematic irrationalism, where individuals were subtly being led to believe that the author of the column was addressing them directly through the use of flattery and vague generalisations.134 Adorno drew a parallel with the phrase opium of the people, by Karl Marx, by commenting "occultism is the metaphysic of the dopes".133:329
A 2005 Gallup poll and a 2009 survey by the Pew Research Center reported that 25% of U.S. adults believe in astrology.135136 According to data released in the National Science Foundation's 2014 Science and Engineering Indicators study, "Fewer Americans rejected astrology in 2012 than in recent years."137 The NSF study noted that in 2012, "slightly more than half of Americans said that astrology was 'not at all scientific,' whereas nearly two-thirds gave this response in 2010. The comparable percentage has not been this low since 1983."137
In India, there is a long-established and widespread belief in astrology. It is commonly used for daily life, particularly in matters concerning marriage and career, and makes extensive use of electional, horary and karmic astrology.138139 Indian politics have also been influenced by astrology.140 It is still considered a branch of the Vedanga.141142 In 2001, Indian scientists and politicians debated and critiqued a proposal to use state money to fund research into astrology,143 resulting in permission for Indian universities to offer courses in Vedic astrology.144
In Japan, a strong belief in astrology has led to dramatic changes in the fertility rate and the number of abortions in the years of "Fire Horse". Women born in hinoeuma years are believed to be unmarriageable and to bring bad luck to their father or husband. In 1966, the number of babies born in Japan dropped by over 25% as parents tried to avoid the stigma of having a daughter born in the hinoeuma year.146147
The fourteenth-century English poets John Gower and Geoffrey Chaucer both referred to astrology in their works, including Gower's Confessio Amantis and Chaucer's The Canterbury Tales.148 Chaucer commented explicitly on astrology in his Treatise on the Astrolabe, demonstrating personal knowledge of one area, judicial astrology, with an account of how to find the ascendant or rising sign.149
In the sixteenth century, John Lyly's 1597 play, The Woman in the Moon, is wholly motivated by astrology,150 while Christopher Marlowe makes astrological references in his plays Doctor Faustus and Tamburlaine (both c. 1590),150 and Sir Philip Sidney refers to astrology at least four times in his romance The Countess of Pembroke's Arcadia (c. 1580).150 Edmund Spenser uses astrology both decoratively and causally in his poetry, revealing "unmistakably an abiding interest in the art, an interest shared by a large number of his contemporaries",150 while George Chapman's play Byron's Conspiracy (1608) similarly uses astrology as a causal mechanism in the drama.151 William Shakespeare's attitude towards astrology is unclear, with contradictory references in plays including King Lear, Antony and Cleopatra, and Richard II.151 Shakespeare was familiar with astrology and made use of his knowledge of astrology "in nearly every play he wrote",151 assuming a basic familiarity with the subject in his commercial audience.151 Outside theatre, the physician and mystic Robert Fludd practised astrology, as did the quack doctor Simon Forman.151 In Elizabethan England, "the usual feeling about astrology ... [was] that it is the most useful of the sciences".151
The most famous piece of music to be influenced by astrology is the orchestral suite The Planets. Written by the British composer Gustav Holst (1874–1934), and first performed in 1918, the framework of The Planets is based upon the astrological symbolism of the planets.152 Each of the seven movements of the suite is based upon a different planet, though the movements are not in the order of the planets from the Sun. The composer Colin Matthews wrote an eighth movement entitled "Pluto, the Renewer", first performed in 2000.153 In 1937, another British composer, Constant Lambert, wrote a ballet on astrological themes, called Horoscope.154 In 1974, the New Zealand composer Edwin Carr wrote The Twelve Signs: An Astrological Entertainment for orchestra without strings.155
- Cultural influence of astrology
- Forer effect
- List of astrological traditions, types, and systems
- List of topics characterized as pseudoscience
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