Astrology is a group of systems, traditions, and beliefs which hold that the relative positions of celestial bodies and related details can provide information about personality, human affairs, and other terrestrial matters. A practitioner of astrology is called an astrologer.

Astrologers believe that the movements and positions of celestial bodies either directly influence life on Earth or correspond to events experienced on a human scale. Modern astrologers define astrology as a symbolic language, an art form, or a form of divination. Despite differences in definitions, a common assumption of astrologers is that celestial placements can aid in the interpretation of past and present events, and in the prediction of the future. Scientists consider astrology a pseudoscience or superstition.

Numerous traditions and applications employing astrological concepts have arisen since its earliest recorded beginnings in the 3rd millennium BC. Astrology has played an important role in the shaping of culture, early astronomy, the Vedas, and various disciplines throughout history. In fact, astrology and astronomy were often indistinguishable before the modern era, with the desire for predictive and divinatory knowledge one of the motivating factors for astronomical observation. Astronomy began to diverge from astrology after a period of gradual separation from the Renaissance up until the 18th century. Eventually, astronomy distinguished itself as the empirical study of astronomical objects and phenomena, without regard to the terrestrial implications of astrology.

The word "astrology" comes from the Latin term astrologia ("astronomy"), which in turn derives from the Greek noun αστρολογία: ἄστρον, astron ("constellation" or "star") and -λογία, -logia ("the study of").

Core beliefs

The core beliefs of astrology were prevalent in parts of the ancient world and are epitomized in the Hermetic maxim, "as above, so below". Tycho Brahe used a similar phrase to summarize his studies in astrology: suspiciendo despicio, "by looking up I see downward". Although the principle that events in the heavens are mirrored by those on Earth was once generally held in most traditions of astrology around the world, in the West there has historically been a debate among astrologers over the nature of the mechanism behind astrology. The debate also covers whether or not celestial bodies are only signs or portents of events, or if they are actual causes of events through some sort of force or mechanism.

Although the connection between celestial mechanics and terrestrial dynamics was explored first by Isaac Newton with his development of a universal theory of gravitation, claims that the gravitational effects of the celestial bodies are what accounts for astrological generalizations are not substantiated by scientific research, nor are they advocated by most astrologers.

Most astrological traditions are based on the relative positions and movements of various real or construed celestial bodies and on the construction of implied or calculated celestial patterns as seen at the time and place of the event being studied. These are chiefly the astrological planets, dwarf planets, the asteroids, the stars, the lunar nodes, Arabic parts and hypothetical planets. The frame of reference for such apparent positions is defined by the tropical or sidereal zodiac of twelve signs on one hand, and by the local horizon (ascendant-descendant axis) and midheaven-imum coeli axis on the other. This latter (local) frame is typically further divided into the twelve astrological houses. Furthermore, the astrological aspects are used to determine the geometric/angular relationship(s) between the various celestial bodies and angles in the horoscope.

Predictive astrology, in the Western tradition, employs two main methods: astrological transits and astrological progressions. In astrological transits the ongoing movements of the planets are interpreted for their significance as they transit through space and the horoscope. In astrological progressions the horoscope is progressed forward in time according to set methods. In Vedic astrology, the focus is on planetary periods to infer the trend, while transits are used to time significant events. Most Western astrologers no longer try to forecast actual events, but focus instead on general trends and developments. By comparison, Vedic astrologers predict both trends and events. Skeptics respond that this practice of western astrologers allows them to avoid making verifiable predictions, and gives them the ability to attach significance to arbitrary and unrelated events, in a way that suits their purpose.

In the past, astrologers often relied on close observation of celestial objects and the charting of their movements. Modern astrologers use data provided by astronomers which are transformed to a set of astrological tables called ephemerides,[15] showing the changing zodiacal positions of the heavenly bodies through time.

Traditions

There are many traditions of astrology, some of which share similar features due to the transmission of astrological doctrines between cultures. Other traditions developed in isolation and hold different doctrines, though they too share some features due to drawing on similar astronomical sources.

Current traditions

The main traditions used by modern astrologers are Hindu Astrology (Jyotiṣa), Western astrology, and Chinese astrology.

Vedic and Western astrology share a common ancestry as horoscopic systems of astrology, in that both traditions focus on the casting of an astrological chart or horoscope, a representation of celestial entities, for an event based on the position of the Sun, Moon, and planets at the moment of the event. However, Vedic astrology uses the sidereal or fixed or constellational zodiac, linking the signs of the zodiac to their original constellations, while Western astrology uses the tropical or seasonal zodiac. Because of the precession of the equinoxes whose cycle is ~25,686 years long, during which the extensions of the polar axes describe circles, over the centuries the twelve zodiacal signs in Western astrology no longer correspond to the same part of the sky as their original constellations. In effect, in Western astrology the link between sign and constellation has been broken in approximately 222 AD, whereas in Vedic astrology the constellations remain of paramount importance. Other differences between the two traditions include the use of 27 (or 28) nakshatras or lunar mansions, each 13 and 1/3 degrees wide, which have been used in India since Vedic times, and the systems of planetary periods known as dashas.

In Chinese astrology, a quite different tradition has evolved. By contrast to Western and Indian astrology, the twelve signs of the zodiac do not divide the sky, but rather the celestial equator. The Chinese evolved a system in which each sign corresponds to one of twelve 'double-hours' that govern the day, and to one of the twelve months. Each sign of the zodiac governs a different year, and combines with a system based on the five elements of Chinese cosmology to give a 60 (12 x 5) year cycle. The term Chinese astrology is used here for convenience, but it must be recognised that versions of the same tradition exist in Korea, Japan, Vietnam, Thailand and other Asian countries. It appears that this is a remnant of a more ancient system of Jupiterian astrology, an astrological system primarily based on the motion of Jupiter, which circuits the Sun every 11.89 years.

Western astrology has been the result of the knowledge of the earlier Indian/Vedic and Egyptian schools (each developed in their own right, and neither shows traces of the later Babylonian influences) being diluted and simplified in passing through first Persia/Babylon, and then through Greece, and later Europe. In modern times, these traditions have come into closer contact with each other, notably with Indian and Chinese astrology having spread in more direct form to the West, while awareness of the modern notions of Western astrology is still fairly limited in Asia, and is not considered useful. Astrology in the Western world has diversified among some in modern times. New movements have appeared that have jettisoned much of more recent traditional astrology to concentrate on different approaches, such as a greater emphasis on midpoints, or a more psychological approach. Some recent Western developments include modern tropical and sidereal horoscopic astrology, including constellational and star or point-based astrology (including aspects to the fundamental planetary dynamics, such as perihelions and aphelions, and nodal points resulting from the inclinations of the planets' revolutionary planes to the Earth's ecliptic plane); heliocentric astrology, cosmobiology; psychological astrology; sun sign astrology; the Hamburg School of Astrology; and Uranian astrology, a subset of the Hamburg School.

Historical traditions

Throughout its long history, astrology has come to prominence in many regions and undergone developments and change. There are many astrological traditions that are historically important, but which have largely fallen out of use. Astrologers still retain an interest in them and regard them as an important resource. Historically significant traditions of astrology include Arab and Persian astrology (Medieval, Near East); Babylonian astrology (Ancient, Near East); Egyptian astrology; Hellenistic astrology (Classical antiquity); and Mayan astrology.

Esoteric traditions

Many mystic or esoteric traditions have links to astrology. In some cases, such as Kabbalah, this involves participants incorporating elements of astrology into their own traditions. In other cases, many astrologers have incorporated other traditions into their own practice of astrology, and astrology has been incorporated into those traditions. Esoteric traditions include, but are not limited to, alchemy, chiromancy, Kabbalistic astrology, medical astrology, numerology, Rosicrucian or "Rose Cross", and Tarot divination.

Historically, alchemy in the Western World was particularly allied and intertwined with traditional Babylonian-Greek style astrology; in numerous ways they were built to complement each other in the search for occult or hidden knowledge. Astrology has used the concept of the four classical elements of alchemy from antiquity up until the present day. Traditionally, each of the seven planets in the solar system known to the ancients was associated with, held dominion over, and "ruled" a certain metal.

Horoscopic astrology

Horoscopic astrology is a system that some claim to have developed in the Mediterranean region and specifically Hellenistic Egypt around the late 2nd or early 1st century BCE. However, horoscopic astrology has been practiced in India since ancient times, and vedic astrology is the oldest surviving form of horoscopic astrology in the world. The tradition deals with two-dimensional diagrams of the heavens, or horoscopes, created for specific moments in time. The diagram is then used to interpret the inherent meaning underlying the alignment of celestial bodies at that moment based on a specific set of rules and guidelines. A horoscope was calculated normally for the moment of an individual's birth, or at the beginning of an enterprise or event, because the alignments of the heavens at that moment were thought to determine the nature of the subject in question. One of the defining characteristics of this form of astrology that makes it distinct from other traditions is the computation of the degree of the Eastern horizon rising against the backdrop of the ecliptic at the specific moment under examination, otherwise known as the ascendant. Horoscopic astrology is the most influential and widespread form of astrology in Africa, India, Europe and the Middle East. Medieval and most modern Western traditions of astrology have Hellenistic origins.

The horoscope

Central to horoscopic astrology and its branches is the calculation of the horoscope or astrological chart. This two-dimensional diagrammatic representation shows the celestial bodies' apparent positions in the heavens from the vantage of a location on Earth at a given time and place. The horoscope is also divided into twelve different celestial houses which govern different areas of life. Calculations performed in casting a horoscope involve arithmetic and simple geometry which serve to locate the apparent position of heavenly bodies on desired dates and times based on astronomical tables. In ancient Hellenistic astrology the ascendant demarcated the first celestial house of a horoscope. The word for the ascendant in Greek was horoskopos from which horoscope derives. In modern times, the word has come to refer to the astrological chart as a whole.

Branches of horoscopic astrology

Traditions of horoscopic astrology can be divided into four branches that are each directed towards specific subjects or purposes. Often these branches use a unique set of techniques, or a different application of the core principles of the system to a different area. Many other subsets and applications of astrology are derived from these four fundamental branches.

Natal astrology is the study of a person's natal chart to gain information about the individual and their life experience. Katarchic astrology includes both electional and event astrology. The former uses astrology to determine the most auspicious moment to begin an enterprise or undertaking, and the latter to understand everything about an event from the time at which it took place. Horary astrology is used to answer a specific question by studying the chart of the moment the question is posed to an astrologer. Mundane or world astrology is the application of astrology to world events, including weather, earthquakes, and the rise and fall of empires or religions. This includes the Astrological Ages, such as the Age of Aquarius, Age of Pisces, and so on. Each age is about 2,150 years in length, and many people use these massive ages to characterise and describe major historical ages, as well as current developments in the world.

History

Many believe that the origins of much of the astrological doctrine and method that would later develop in Asia, Europe, and the Middle East are found among the ancient Babylonians and their system of celestial omens that began to be compiled around the middle of the 2nd millennium BCE. They believe this system of celestial omens later spread, either directly or indirectly through the Babylonians and Assyrians, to other areas such as India, Middle East, and Greece, where it merged with pre-existing indigenous forms of astrology. Thus, Babylonian astrology migrated to Greece, initially as early as the middle of the 4th century BCE, and then around the late 2nd or early 1st century BCE, after the Alexandrian conquests, this Babylonian astrology was mixed with the Egyptian tradition of decanic astrology to create horoscopic astrology. This new form of astrology, which appears to have originated in Alexandrian Egypt, spread across the ancient world into Europe, the Middle East, and India.

Before the modern era

The differentiation between astronomy and astrology varied from place to place; they were strongly linked in ancient India, ancient Babylonia and medieval Europe, but separated to an extent in the Hellenistic world. The first semantic distinction between astrology and astronomy was given in the 11th century by the Persian astronomer, Abū Rayhān al-Bīrūnī (see astrology and astronomy).

The pattern of astronomical knowledge gained from astrological endeavours has been historically repeated across numerous cultures, from ancient India through the classical Maya civilization to medieval Europe. Given this historical contribution, astrology has been called a protoscience along with disciplines such as alchemy.

Astrology was not without criticism before the modern era; it was often challenged by Hellenistic skeptics, church authorities, and medieval Muslim astronomers, such as Al-Farabi (Alpharabius), Ibn al-Haytham (Alhazen), Abū Rayhān al-Bīrūnī, Avicenna and Averroes. Their reasons for refuting astrology were often due to both scientific (the methods used by astrologers being conjectural rather than empirical) and religious (conflicts with orthodox Islamic scholars) reasons.[23] Ibn Qayyim Al-Jawziyya (1292–1350), in his Miftah Dar al-SaCadah, used empirical arguments in astronomy in order to refute astrology and divination.[24]

Many prominent thinkers, philosophers and scientists, such as Galen, Paracelsus, Girolamo Cardan, Nicolaus Copernicus, Taqi al-Din, Tycho Brahe, Galileo Galilei, Johannes Kepler, Carl Jung and others, practiced or significantly contributed to astrology.

Modern approaches

Several innovations have occurred in astrological practice in modern times.

Western

During the middle of the 20th century, Alfred Witte and, following him, Reinhold Ebertin pioneered the use of midpoints (see midpoint (astrology)) in horoscopic analysis. From the 1930s to the 1980s, astrologers including Dane Rudhyar, Liz Greene and Stephen Arroyo pioneered the use of astrology for psychological analysis, with some following the lead of psychologists like Carl Jung. In the 1930s, Don Neroman developed and popularised in Europe a form of Locational Astrology under the name of "Astrogeography." In the 1970s, American astrologer Jim Lewis developed and popularized a different approach under the name of Astrocartography. Both methods purport to identify varying life conditions through differences in location.

Vedic (Hindu Astrology)

Indian astrology uses a different zodiac than Western astrology and is a branch of Vedic science.[27][28] In India, there is a long-established widespread belief in astrology, and it is commonly used for daily life, foremost with regard to marriages, and secondarily with regard to career and electional and karmic astrology. In the 1960s, H.R. Seshadri Iyer, introduced a system including the concepts of yogi and avayogi. It generated interest with research oriented astrologers in the West. From the early 1990s, Indian vedic astrologer and author, V.K. Choudhry has created and developed the Systems' Approach for Interpreting Horoscopes, a simplified system of Jyotish (predictive astrology) The system, also known as "SA", helps those who are trying to learn Jyotisha. The late K. S. Krishnamurti developed the Krishnamurti Paddhati system based on the analysis of the stars (nakshatras), by sub-dividing the stars in the ratio of the dasha of the concerned planets. The system is also known as "KP" and "sub theory". In 2001, Indian scientists and politicians debated and critiqued a proposal to use state money to fund research into Vedic astrology.

Effects on world culture

Astrology has had a profound influence over the past few thousand years on Western and Eastern cultures. In the Middle Ages, when te educated of the time believed in astrology, the system of heavenly spheres and bodies was believed to reflect on the system of knowledge and the world itself below. Belief in astrology holds firm today in many parts of the world: in one poll, 31% of Americans expressed a belief in astrology and, according to another study, 39% considered it scientific.

Astrology has had an influence on both language and literature. For example, influenza, from medieval Latin influentia meaning influence, was so named because doctors once believed epidemics to be caused by unfavorable planetary and stellar influences. The word "disaster" comes from the Italian disastro, derived from the negative prefix dis- and from Latin aster "star", thus meaning "ill-starred" Adjectives "lunatic" (Luna/Moon), "mercurial" (Mercury), "venereal" (Venus), "martial" (Mars), "jovial" (Jupiter/Jove), and "saturnine" (Saturn) are all old words used to describe personal qualities said to resemble or be highly influenced by the astrological characteristics of the planet, some of which are derived from the attributes of the ancient Roman gods they are named after. In literature, many writers, notably Geoffrey Chaucer and William Shakespeare,[ used astrological symbolism to add subtlety and nuance to the description of their characters' motivation(s). More recently, Michael Ward has proposed that C.S. Lewis imbued his Chronicles of Narnia with the characteristics and symbols of the seven heavens. Often, an understanding of astrological symbolism is needed to fully appreciate such literature.

Some modern thinkers, notably Carl Jung, believe in astrology's descriptive powers regarding the mind without necessarily subscribing to its predictive claims. In education astrology is reflected in the university education of medieval Europe, which was divided into seven distinct areas, each represented by a particular planet and known as the seven liberal arts. Dante Alighieri speculated that these arts, which grew into the sciences we know today, fitted the same structure as the planets. In music the best known example of astrology's influence is in the orchestral suite called "The Planets" by the British composer Gustav Holst, the framework of which is based upon the astrological symbolism of the planets.

Astrology and science

By the time of Francis Bacon and the scientific revolution, newly emerging scientific disciplines acquired a method of systematic empirical induction based upon experimental observations. At this point, astrology and astronomy began to diverge; astronomy became one of the central sciences while astrology was increasingly viewed as an occult science or superstition by natural scientists. For example, Christiaan Huygens wrote in his Cosmotheoros: "And as for the Judicial Astrology, that pretends to foretel what is to come, it is such a ridiculous, and oftentimes mischievous Folly, that I do not think it fit to be so much as named." This separation accelerated through the eighteenth and nineteenth centuries.

Contemporary scientists such as Richard Dawkins and Stephen Hawking regard astrology as unscientific, and those such as Andrew Fraknoi of the Astronomical Society of the Pacific have labeled it a pseudoscience. In 1975, the American Humanist Association characterized those who have faith in astrology 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". Astronomer Carl Sagan was unwilling to sign the statement, not because he felt astrology was valid, but because he found the statement's tone authoritarian. Sagan stated that he would instead have been willing to sign a statement describing and refuting the principal tenets of astrological belief, which he believed would have been more persuasive and would have produced less controversy than the circulated statement.

Although astrology has not been considered a science for some time, it has been the subject of considerable research by astrologers since the beginning of the twentieth century. In their study of twentieth-century research into natal astrology, former astrologer turned astrology critic Geoffrey Dean, and coauthors, documented this burgeoning research activity performed primarily within the astrological community.

Research

Studies have repeatedly failed to demonstrate statistically significant relationships between astrological predictions and operationally-defined outcomes. Effect size tests of astrology-based hypotheses conclude that the mean accuracy of astrological predictions is no greater than what is expected by chance. For example, when testing for cognitive, behavioral, physical and other variables, one study of 2000 astrological "time twins" born within minutes of each other did not show a celestial influence on human characteristics. It has been suggested that other statistical research is often wrongly seen as evidence for astrology due to uncontrolled artifacts.

Experimental psychologists have suggested that several different effects can contribute to perception of astrological accuracy. One observed tendency is known as the confirmation bias, whereby people who are given a set of multiple predictions tend to remember more of the accurate predictions ("hits") than the inaccurate ones ("misses"). Consequently, people tend to recall the set of predictions as being more accurate than it actually was. A second psychological phenomenon is known as the Forer effect, which refers to a tendency for individuals to give high accuracy ratings to descriptions of their personality that are presented to them as tailored specifically for them, but are in fact vague and general enough to apply to a wide range of people. When astrological predictions turn out to correspond with some phenomena but not with others, the recollected integrity of these predictions may stem in part from confirmation bias. When predictions use vague language, their individualized appearance may be partially attributable to the Forer effect.

The French psychologist and statistician who devoted his life to the attempt to demonstrate the validity of certain fundamentals of astrology, Michel Gauquelin, wrote that he had found correlations between some planetary positions and certain human traits such as vocations. Gauquelin's most widely known concept is the Mars effect, which denotes a correlation between the planet Mars occupying certain positions in the sky more often at the birth of eminent sports champions than at the birth of ordinary people. A similar idea is explored by Richard Tarnas in his work Cosmos and Psyche, in which he examines correspondences between planetary alignments and historically significant events and individuals. Since its original publication in 1955, the Mars effect has been the subject of critical studies and skeptical publications which aim to refute it, and of studies in fringe journals used to support or expand the original ideas. Gauquelin's research has not received mainstream scientific notice.

Obstacles to research

Astrologers have argued that there are significant obstacles in carrying out scientific research into astrology today, including lack of funding, lack of background in science and statistics by astrologers, and insufficient expertise in astrology by research scientists and skeptics. Some astrologers have argued that few practitioners today pursue scientific testing of astrology because they feel that working with clients on a daily basis provides personal validation for their clients.

Another argument made by astrologers is that most studies of astrology do not reflect the nature of astrological practice and that the scientific method does not apply to astrology. Some astrology proponents argue that the prevailing attitudes and motives of many opponents of astrology introduce conscious or unconscious bias in the formulation of hypotheses to be tested, the conduct of the tests, and the reporting of results.

Mechanism

Astrologers have not presented consistent explanations of physical mechanisms underlying astrological beliefs, and few modern astrologers believe in a direct causal relationship between heavenly bodies and earthly events. An editorial published by the Astronomical Society of the Pacific reports no evidence for a scientifically defined mechanism by which celestial objects can influence terrestrial affairs. Researchers have posited acausal, purely correlative, relationships between astrological observations and events, such as the theory of synchronicity proposed by Carl Jung. Others have posited a basis in divination. Others have argued that empirical correlations stand on their own epistemologically, and do not need the support of any theory or mechanism. To some observers, these non-mechanistic concepts raise serious questions about the feasibility of validating astrology through scientific testing, and some have gone so far as to reject the applicability of the scientific method to astrology entirely. Some astrologers, on the other hand, believe that astrology is amenable to the scientific method, given sufficiently sophisticated analytical methods, and they cite pilot studies to support this view. Consequently, several astrologers have called for or advocated continuing studies of astrology based on statistical validation.

Aries (astrology)

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Zodiac Symbol	Bull
Duration (Tropical, Western)	20 April – 21 May (2010, UTC)
Duration (Sidereal, Hindu)[1]	14 May – 7 June (2010, UTC)
Constellation	Taurus
Zodiac Element	Earth
Zodiac Quality	Fixed
Domicile	Venus
Detriment	Mars/Pluto
Exaltation	Moon
Fall	Uranus
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Gemini

Zodiac Symbol	Twins
Duration (Tropical, Western)	21 May – 21 June (2010, UTC)
Duration (Sidereal, Hindu)[1]	14 June – 7 July (2010, UTC)
Constellation	Gemini
Zodiac Element	Air
Zodiac Quality	Mutable
Domicile	Mercury
Detriment	Jupiter
Exaltation	North Node
Fall	South Node

Zodiac Symbol	Crab
Duration (Tropical, Western)	21 June – 22 July (2010, UTC)
Duration (Sidereal, Hindu)[1]	14 July – 6 August (2010, UTC)
Constellation	Cancer
Zodiac Element	Water
Zodiac Quality	Cardinal
Domicile	Moon
Detriment	Saturn
Exaltation	Jupiter
Fall	Mars

Zodiac Symbol	Lion
Duration (Tropical, Western)	22 July – 23 August (2010, UTC)
Duration (Sidereal, Hindu)[1]	14 August – 7 September (2010, UTC)
Constellation	Leo
Zodiac Element	Fire
Zodiac Quality	Fixed
Domicile	Sun
Detriment	Uranus and Saturn
Exaltation	None traditionally
Fall	None traditionally
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