Western astrology

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Western astrology is the system of astrology most popular in Western countries. Western astrology is historically based on Ptolemy's Tetrabiblos (2nd century AD), which in turn was a continuation of Hellenistic and ultimately Babylonian traditions.[citation needed]

Western astrology is largely horoscopic, that is, it is a form of divination based on the construction of a horoscope for an exact moment, such as a person's birth, in which various cosmic bodies are said to have an influence. Astrology in western popular culture is often reduced to sun sign astrology, which considers only the individual's date of birth (i.e. the "position of the Sun" at that date).

Because astrology has failed in predictions when under scientific tests, it is generally regarded as pseudoscientific.

Core principles[edit]

Robert Fludd's 16th-century illustration of man the microcosm within the universal macrocosm

A central principle of astrology is integration within the cosmos. The individual, Earth, and its environment are viewed as a single organism, all parts of which are correlated with each other.[1] Cycles of change that are observed in the heavens are therefore reflective (not causative) of similar cycles of change observed on earth and within the individual.[2] This relationship is expressed in the Hermetic maxim "as above, so below; as below, so above", which postulates symmetry between the individual as a microcosm and the celestial environment as a macrocosm.[3] At the heart of astrology is the metaphysical principle that mathematical relationships express qualities or ‘tones' of energy which manifest in numbers, visual angles, shapes and sounds – all connected within a pattern of proportion. Pythagoras first identified that the pitch of a musical note is in proportion to the length of the string that produces it, and that intervals between harmonious sound frequencies form simple numerical ratios.[4] In a theory known as the Harmony of the Spheres, Pythagoras proposed that the Sun, Moon and planets all emit their own unique hum based on their orbital revolution,[5] and that the quality of life on Earth reflects the tenor of celestial sounds which are physically imperceptible to the human ear.[3] Subsequently, Plato described astronomy and music as "twinned" studies of sensual recognition: astronomy for the eyes, music for the ears, and both requiring knowledge of numerical proportions.[6]

Later philosophers retained the close association between astronomy, optics, music and astrology, including Ptolemy, who wrote influential texts on all these topics.[7] Al-Kindi, in the 9th century, developed Ptolemy's ideas in De Aspectibus which explores many points of relevance to astrology and the use of planetary aspects.[8]

The zodiac[edit]

Main article: Zodiac

The zodiac is the belt or band of constellations through which the Sun, Moon, and planets move on their journey across the sky. Astrologers noted these constellations and so attached a particular significance to them. Over time they developed the system of twelve signs of the zodiac, based on twelve of the constellations through which the sun passes throughout the year, those constellations that are "Enlightened by the mind". Most western astrologers use the tropical zodiac beginning with the sign of Aries at the Northern hemisphere Vernal Equinox always on or around March 21 of each year. The Western Zodiac is drawn based on the Earth's relationship to fixed, designated positions in the sky, and the Earth's seasons. The Sidereal Zodiac is drawn based on the Earth's position in relation to the constellations, and follows their movements in the sky. Due to a phenomenon called precession of the equinoxes (where the Earth's axis slowly rotates like a spinning top in a 25,700 year cycle), there is a slow shift in the correspondence between Earth's seasons (and calendar) and the constellations of the zodiac. Thus, the tropical zodiac corresponds with the position of the earth in relation to fixed positions in the sky (Western Astrology), while the sidereal zodiac is drawn based on the position in relation to the constellations (sidereal zodiac).[9]

The twelve signs[edit]

In modern Western astrology the signs of the zodiac are believed to represent twelve basic personality types or characteristic modes of expression. The twelve signs are divided into four elements fire, earth, air and water. Fire and air signs are considered masculine, while water and earth signs are considered feminine.[10] The twelve signs are also divided into three qualities, Cardinal, fixed and mutable.[11][12]

Sign Approximate dates of
Sun signs
Sun signs dates
for current year 2015-2016
Element Quality
Start End Start End
Aries.svg Aries The Ram March 21 April 19 March 21 April 19 Fire Cardinal
Taurus.svg Taurus The Bull April 20 May 20 April 20 May 20 Earth Fixed
Gemini.svg Gemini The Twins May 21 June 21 May 21 June 21 Air Mutable
Cancer.svg Cancer The Crab June 22 July 22 June 22 July 23 Water Cardinal
Leo.svg Leo The Lion July 23 August 22 July 24 August 27 Fire Fixed
Virgo.svg Virgo The Virgin August 23 September 22 August 28 September 23 Earth Mutable
Libra.svg Libra The Scales September 23 October 22 September 24 October 23 Air Cardinal
Scorpio.svg Scorpio The Scorpion October 23 November 20 October 24 November 20 Water Fixed
Sagittarius.svg Sagittarius The Archer November 21 December 21 November 21 December 21 Fire Mutable
Capricorn.svg Capricorn The Mountain Sea-Goat December 22 January 20 December 22 January 17 Earth Cardinal
Aquarius.svg Aquarius The Water Bearer January 21 February 21 January 18 February 20 Air Fixed
Pisces.svg Pisces The Fish February 22 March 20 February 21 March 20 Water Mutable
  • Note: these are only approximations and the exact date on which the sign of the sun changes varies from year to year.

Zodiac sign for an individual depends on the placement of planets and the ascendant in that sign. If a person has nothing placed in a particular sign, that sign will play no active role in their personality. On the other hand a person with, for example, both the sun and moon in Cancer, will strongly display the characteristics of that sign in their make up.

Sun-sign astrology[edit]

Main article: Sun sign astrology

Newspapers often print astrology columns which purport to provide guidance on what might occur in a day in relation to the sign of the zodiac that included the sun when the person was born. Astrologers refer to this as the "sun sign", but it is often commonly called the "star sign". These predictions are vague or general; so much so that even practising astrologers consider them of little to no value. Experiments have shown that when people are shown a newspaper horoscope for their own sign along with a newspaper horoscope for a different sign, they judge them to be equally accurate on the average.[13] Other tests have been performed on complete, personalized horoscopes cast by professional astrologers, and have shown similarly disappointing results,[14] contrary to the claims of professional astrologers.

The planets[edit]

Main article: Planets in astrology

In modern Western astrology the planets represent basic drives or impulses in the human psyche. These planets differ from the definition of a planet in astronomy in that the sun, moon, and recently, Pluto and Ceres (considered as dwarf planets in astronomy), are all considered to be planets for the purposes of astrology. Each planet is also said to be the ruler of one or two zodiac signs. The three modern planets have each been assigned rulership of a zodiac sign by astrologers and Ceres has been suggested as the ruler of Taurus or Virgo.[15] Traditionally rulership of the signs was, according to Ptolemy, based on seasonal derivations and astronomical measurement, whereby the luminaries being the brightest planets were given rulership of the brightest months of the year and Saturn the coldest furthest classical planet was given to the coldest months of the year, with the other planets ruling the remaining signs as per astronomical measurement. It is noteworthy that the modern rulerships do not follow the same logic.

Classical planets[edit]

The astrological 'planets' are the seven heavenly bodies known to the ancients. The sun and moon, also known as 'the lights', are included as they were thought to act like the astronomical planets. Astrologers call Mercury, Venus and Mars the 'personal planets', as they represent the most immediate drives. The 'lights' symbolise respectively the existential and sensitive fundamentals of the individuality.

The following table summarizes the rulership by the seven classically-known planets[16] of each of the twelve astrological signs,[17] together with their effects on world events, people and the earth itself as understood in the Middle Ages.[18]

Traditional planets with their rulership of signs and effects on people and the world
Symbol Planet[16] Rules the sign[17] Effect on world events[18] Person's nature[18] Effect in life[18] Effect in earth[18]
Sun symbol.svg Sun Leo Wisdom, generosity, 'sunny' disposition Good fortune Gold
Moon symbol crescent.svg Moon Cancer Wandering Travel, lunacy Silver
Mercury symbol.svg Mercury Gemini and Virgo Action Changeability, eagerness, quickness, 'mercurial' temperament Rapid change Mercury (quicksilver)
Venus symbol.svg Venus Libra and Taurus Fortunate events Beauty, amorousness Good luck Copper[19]
Mars symbol.svg Mars Aries, classically also Scorpio War Strength, endurance, 'martial' temperament Conflicts, misfortune Iron
Jupiter symbol.svg Jupiter Sagittarius, classically also Pisces Good times, prosperity Cheerful, magnanimous, 'jovial' temperament Good fortune Tin
Saturn symbol.svg Saturn Capricorn, classically also Aquarius Disastrous events Wisdom, stability, persistence, 'saturnine' temperament Accidents, disease, treachery, bad luck Lead

The moon's nodes[edit]

Also important in astrology are the moon's nodes.[20] The nodes are where the moon's path crosses the ecliptic. The North, or Ascending Node marks the place where the moon crosses from South to North (or ascends), while the South, or Descending Node marks where the moon crosses from North to South (or descends). While Lunar nodes are not considered by Western astrologers to be as important a factor as each of the planets, they are thought to mark sensitive areas that are worth taking into account.

  • Northnode-symbol.svg - North or ascending Node. Also the ruler of Pathways and Choices.
  • Southnode-symbol.svg - South or descending Node. Also the ruler of Karma and the Past.

Essential dignity[edit]

In astrology, "essential dignity" is the strength of a planet or point's zodiac position, judged only by its position by sign and degree, what the pre-eminent 17th-century astrologer William Lilly called "the strength, fortitude or debility of the Planets [or] significators."[21] In other words, essential dignity seeks to view the strengths of a planet or point as though it were isolated from other factors in the sky of the natal chart. Traditionally, there are five dignities; domicile and detriment, exaltation and fall, triplicity, terms, and face. However, the later two have diminished in usage. A planet's domicile is the zodiac sign over which it has rulership.

The horoscope[edit]

Main article: Horoscope

Western astrology is based mainly upon the construction of a horoscope, which is a map or chart of the heavens at a particular moment. The moment chosen is the beginning of the existence of the subject of the horoscope, as it is believed that the subject will carry with it the pattern of the heavens from that moment throughout its life. The most common form of horoscope is the natal chart based on the moment of a person's birth; though in theory a horoscope can be drawn up for the beginning of anything, from a business enterprise to the foundation of a nation state.


In Western horoscopic astrology the interpretation of a horoscope is governed by:

Some astrologers also use the position of various mathematical points such as the Arabic parts.

The primary angles[edit]


  • Ascendant-symbol.svg - The ascendant or rising sign is the eastern point where the ecliptic and horizon intersect. During the course of a day, because of the Earth's rotation, the entire circle of the ecliptic will pass through the ascendant and will be advanced by about 1°. This provides us with the term rising sign', which is the sign of the zodiac that was rising in the east at the exact time that the horoscope or natal chart is calculated. In creating a horoscope the ascendant is traditionally placed as the left-hand side point of the chart. In most house systems the ascendant lies on the cusp of the 1st house of the horoscope.

The ascendant is generally considered the most important and personalized angle in the horoscope by the vast majority of astrologers. It signifies a person's awakening consciousness, in the same way that the Sun's appearance on the eastern horizon signifies the dawn of a new day.[22] Due to the fact that the ascendant is specific to a particular time and place, it signifies the individual environment and conditioning that a person receives during their upbringing, and also the circumstances of their childhood. For this reason, the ascendant is also concerned with how a person has learned to present him or herself to the world, especially in public and in impersonal situations.[23]

The opposite point to the ascendant in the west is the descendant, which denotes how a person reacts in their relationships with others. It also show the kind of person we are likely to be attracted to, and our ability to form romantic attachments. In most house systems the descendant lies on the cusp of the 7th house of the horoscope.

  • Midheaven-symbol.svg- The midheaven or medium coeli is the point on the ecliptic that is furthest above the plane of the horizon. For events occurring where the planes of the ecliptic and the horizon coincide, the limiting position for these points is located 90° from the ascendant. For astrologers, the midheaven traditionally indicates a person's career, status, aim in life, aspirations, public reputation, and life goal. In quadrant house systems the midheaven lies on the cusp of the 10th house of the horoscope.

The opposite point to the midheaven is known as the imum coeli. For astrologers the nadir or IC traditionally indicates the circumstances at the beginning and end of a person's life, their parents and the parental home, and their own domestic life. In quadrant house systems it lies on the cusp of the 4th house of the horoscope.

The houses[edit]

Main article: House (astrology)

The horoscope is divided by astrologers into 12 portions called the houses. The houses of the horoscope are interpreted as being 12 different spheres of life or activity. There are various ways of calculating the houses in the horoscope or birth chart. However, there is no dispute about their meanings, and the 12 houses[24]

Many modern astrologers assume that the houses relate to their corresponding signs, i.e. that the first house has a natural affinity with the first sign, Aries, and so on.


Main article: Astrological aspects

The aspects are the angles the planets make to each other in the horoscope, and also to the ascendant, midheaven, descendant and nadir. The aspects are measured by the angular distance along the ecliptic in degrees and minutes of celestial longitude between two points, as viewed from the earth.[25] They indicate focal points in the horoscope where the energies involved are given extra emphasis. The more exact the angle, the more powerful the aspect, although an allowance of a few degrees each side of the aspect called an orb is allowed for interpretation. The following are the aspects in order of importance[26]

  • Conjunction-symbol.svg - Conjunction 0° (orb ±8°). The conjunction is a major point in the chart, giving strong emphasis to the planets involved. The planets will act together to outside stimulus and act on each other.[26]
  • Opposition-symbol.svg - Opposition 180° (orb ±8°). The opposition is indicative of tension, conflict and confrontation, due to the polarity between the two elements involved. Stress arises when one is used over the other, causing an imbalance; but the opposition can work well if the two parts of the aspect are made to complement each other in a synthesis.[26]
  • Trine-symbol.svg - Trine 120°(orb ±8°). The trine indicates harmony, and ease of expression, with the two elements reinforcing each other. The trine is a source of artistic and creative talent, but can be a 'line of least resistance' to a person of weak character.[26]
  • Square-symbol.svg - Square 90°(orb ±8°). The square indicates frustration, inhibitions, disruption and inner conflict, but can become a source of energy and activation to a person determined to overcome limitations.[26]
  • Sextile-symbol.svg - Sextile 60°(orb ±6°). The sextile is similar to the trine, but of less significance. It indicates ease of communication between the two elements involved, with compatibility and harmony between them.[26]
  • Quincunx-symbol.svg - Quincunx 150°(orb ±3°). The quincunx indicates difficulty and stress, due to incompatible elements being forced together. It can mean an area of self-neglect in a person's life (especially health), or obligations being forced on a person. The quincunx can vary from minor to quite major in impact.[26]
  • Semisextile-symbol.svg - Semisextile 30° (orb ±2°). Slight in effect. Indicates an area of life where a conscious effort to be positive will have to be made.[26]
  • Semisquare-symbol.svg - Semisquare 45°(orb ±2°). Indicates somewhat difficult circumstance. Similar in effect to semisextile.[26]
  • Sesquisquare-symbol.svg - Sesquiquadrate 135°(orb ±2°). Indicates somewhat stressful conditions. Similar to semisextile.[26]
  • Quintile-symbol.svg - Quintile 72° (orb ±2°). Slight in effect. Indicates talent and vaguely fortunate circumstances.[26]
  • Biquintile-symbol.svg - Biquintile 144° (orb ±2°). Slight in effect. Indicates talent and vaguely fortunate circumstances.[26]
  • Retrograde-symbol.svg - Retrograde: A planet is retrograde when it appears to move backwards across the sky when seen from the earth, due to one planet moving more quickly relative to the other. Although it is not an aspect, some astrologers believe that it should be included for consideration in the chart. Planets which are retrograde in the natal chart are considered by them to be potential weak points.[26]

Modern modifications to the Ptolemaic system[edit]

Modern planets[edit]

These are the planets discovered in modern times, which have since been assigned meanings by Western astrologers.

Planets discovered in modern times, with signs and effects
Symbol Planet Representing Rules the sign Claimed effects on world events Claimed effects on people
Uranus's astrological symbol.svg Uranus Letter 'H' for planet's discoverer, William Herschel[27] Aquarius Innovation, technology[28] Sudden or disruptive change[29]
Neptune symbol.svg Neptune Trident, weapon of sea-god Neptune[30] Pisces[31] Confusion, sensitivity[31]
Pluto's astrological symbol.svg Pluto symbol.svg Pluto PL for astronomer Percival Lowell who predicted Pluto's discovery[32] Scorpio Transformation,[33] fate, death
Ceres symbol.svg Ceres Sickle, Ceres being goddess of corn[34] (sometimes taken to be Virgo) Mothering, compassion[35]

Sidereal and tropical astrology[edit]

There are two camps of thought among western astrologers about the "starting point", 0 degrees Aries, in the zodiac. Sidereal astrology uses a fixed starting point in the background of stars, while tropical astrology, used by the majority of Western astrologers, chooses as a starting point the position of the Sun against the background of stars at the Northern hemisphere vernal equinox (i.e. when the Sun position against the heavens crosses over from the southern hemisphere to the northern hemisphere) each year.

As the Earth spins on its axis, it "wobbles" like a top, causing the vernal equinox to move gradually backwards against the star background, (a phenomenon known as the Precession of the equinoxes) at a rate of about 30 degrees (one Zodiacal sign length) every 2,160 years. Thus the two zodiacs would be aligned only once every 26,000 years. They were aligned about 2,000 years ago when the zodiac was originally established.

This phenomenon gives us the conceptual basis for the Age of Aquarius, whose "dawning" coincides with the movement of the vernal equinox across the cusp from Pisces to Aquarius in the star background.

Astrology and science[edit]

Main article: Astrology and science

The majority of professional astrologers rely on performing astrology-based personality tests and making relevant predictions about the remunerator's future.[36]:83 Those who continue to have faith in astrology have been characterised 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".[37]

Astrology has not demonstrated its effectiveness in controlled studies and has no scientific validity,[36]:85[38] and as such, is regarded as pseudoscience.[39][40][41]:1350 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.[42]:249[43]

Where astrology has made falsifiable predictions, it has been falsified.[38]:424 The most famous test was headed by Shawn Carlson and included a committee of scientists and a committee of astrologers. It led to the conclusion that natal astrology performed no better than chance.[44]

See also[edit]


  1. ^ Manilius (77) p.87-89 (II.64-67): “the entire universe is alive in mutual concord of its elements and is driven by the pulse of reason, since a single spirit dwells in all its parts and, speeding through all things, nourishes it like a living creature”.
  2. ^ Al-Kindi (9th century) is clarifying this point where he says in his text On the Stellar Rays, ch.4: “... we say that one thing acts with its elemental rays on another, but according to the exquisite truth it does not act but only the celestial harmony acts”.
  3. ^ a b Houlding (2000) p.28: “The doctrine of the Pythagoreans was a combination of science and mysticism… Like Anaximenes they viewed the Universe as one integrated, living organism, surrounded by Divine Air (or more literally ‘Breath’), which permeates and animates the whole cosmos and filters through to individual creatures… By partaking of the core essence of the Universe, the individual is said to act as a microcosm in which all the laws in the macrocosm of the Universe are at work”.
  4. ^ Weiss and Taruskin (2008) p.3.
  5. ^ Pliny the Elder (77) pp.277-8, (II.xviii.xx): "…occasionally Pythagoras draws on the theory of music, and designates the distance between the Earth and the Moon as a whole tone, that between the Moon and Mercury as a semitone, .... the seven tones thus producing the so-called diapason, i.e. a universal harmony".
  6. ^ Davis (1901) p.252. Plato’s Republic VII.XII reads: “As the eyes, said I, seem formed for studying astronomy, so do the ears seem formed for harmonious motions: and these seem to be twin sciences to one another, as also the Pythagoreans say”.
  7. ^ Smith (1996) p.2.
  8. ^ Hackett (1997) p.245 and Smith (1996) p.56.
  9. ^ Wood, Chauncey (1970). "Appendix: The Workings of Astrology". Chaucer and the Country of the Stars. Princeton University Press. pp. 298–305. 
  10. ^ Myrna Lofthus, A spiritual approach to astrology, p.8, CRCS Publications, Sebastopol, CA 1983.
  11. ^ Pelletier, Robert; Cataldo, Leonard (1984). Be Your Own Astrologer: All You Need to Know to Draw Up Your Own Birth Chart. London: Pan Books Ltd. pp. 24–33. ISBN 9780330284769. 
  12. ^ Pottenger, Maritha (1991). Astro Essentials. San Diego: ACS Publications. pp. 31–36. 
  13. ^ The Forer Effect
  14. ^ The AstroTest, An account of a test of the predictive power of astrology, with references to other experiments.
  15. ^ Sasha Fenton, Understanding Astrology, pp. 106–15, Aquarian Press, London, 1991; Maritha Pottinger, Ibid, pp. 11–17, 1991.
  16. ^ a b Planet description
  17. ^ a b Signs description
  18. ^ a b c d e Lewis, C.S. (1994, first published 1964). The Discarded Image: An Introduction to Medieval and Renaissance Literature. Cambridge University Press. pp. 105–109. ISBN 978-0-521-47735-2.  Check date values in: |date= (help)
  19. ^ Lewis notes that Venus was associated with the island of Cyprus, the classical source of copper.
  20. ^ Derek and Julia Parker, The New Compleat Astrologer p. 149, Crescent Books, New York, 1990.
  21. ^ Lilly 2005, p. 101.
  22. ^ Jeff Mayo, Teach Yourself Astrology p. 71, Hodder & Stoughton, London, 1991.
  23. ^ Sasha Fenton, Rising Signs, pp. 13–14, The Aquarian Press, London, 1989.
  24. ^ Sasha Fenton, Ibid, pp. 117–8, 1991.
  25. ^ Jeff Mayo, Ibid p. 97, 1991.
  26. ^ a b c d e f g h i j k l m Robert Pelletier and Leonard Cataldo, Ibid, pp. 57–60, 1984; Sasha Fenton, Ibid, pp. 137-9, 1991.
  27. ^ "The meaning of the symbol H+o for the planet Uranus". Original letter by F. Herschel, The Observatory, 1917 (SAO/NASA Astrophysics Data System (ADS)) 30: 306–307. Bibcode:1917Obs....40..306H. Retrieved 3 July 2013. 
  28. ^ Bidisha (9 December 2011). "I'm starry-eyed about horoscopes". The Guardian. Retrieved 3 July 2013. 
  29. ^ Parker, Julia; Parker, Derek (2007). Astrology. Dorling Kindersley. p. 237. 
  30. ^ "Neptune's Symbol". NASA. Retrieved 3 July 2013. 
  31. ^ a b Parker, Julia; Parker, Derek (2007). Astrology. Dorling Kindersley. pp. 240–242. 
  32. ^ "Pluto's Symbol". NASA. Retrieved 3 July 2013. 
  33. ^ Padel, Ruth (20 April 2013). "Pluto by Glyn Maxwell – review". The Guardian. Retrieved 3 July 2013. 
  34. ^ "Ceres". Universe - Galaxies and Stars. Retrieved 3 July 2013. 
  35. ^ Parker, Julia; Parker, Derek (2007). Astrology. Dorling Kindersley. p. 201. 
  36. ^ a b Bennett, Jeffrey; Donohue, Megan; Schneider, Nicholas; Voit, Mark (2007). The cosmic perspective (4th ed.). San Francisco, CA: Pearson/Addison-Wesley. pp. 82–84. ISBN 0-8053-9283-1. 
    • The Humanist, volume 36, no.5 (1976).
    • Bok, Bart J.; Lawrence E. Jerome; Paul Kurtz (1982). "Objections to Astrology: A Statement by 186 Leading Scientists". In Patrick Grim. Philosophy of Science and the Occult. Albany: State University of New York Press. pp. 14–18. ISBN 0-87395-572-2. 
  38. ^ a b Zarka, Philippe (2011). "Astronomy and astrology". Proceedings of the International Astronomical Union 5 (S260): 420–425. doi:10.1017/S1743921311002602. 
  39. ^ Hansson, Sven Ove; Zalta, Edward N. "Science and Pseudo-Science". Stanford Encyclopedia of Philosophy. Retrieved 6 July 2012. 
  40. ^ "Astronomical Pseudo-Science: A Skeptic's Resource List". Astronomical Society of the Pacific. 
  42. ^ Vishveshwara, S.K.; Biswas, D.C.V.; Mallik, C.V., eds. (1989). Cosmic perspectives: essays dedicated to the memory of M.K.V. Bappu (1. publ. ed.). Cambridge [England]: Cambridge University Press. ISBN 0-521-34354-2. 
  43. ^ Peter D. Asquith, ed. (1978). Proceedings of the Biennial Meeting of the Philosophy of Science Association 1. Dordrecht u.a.: Reidel u.a. ISBN 978-0-917586-05-7. 
  44. ^ Carlson, Shawn (1985). "A double-blind test of astrology" (PDF). Nature 318 (6045): 419–425. Bibcode:1985Natur.318..419C. doi:10.1038/318419a0. 

External links[edit]

  • The Astrotest - An account of a test of the predictive power of astrology, with references to other experiments.