Tirumurai: the twelve volumes of Tamil ShaiviteNayanars hymns of the sixty-three
1, 2, 3. Tirukadaikkappu	Thiru Gnana Sambanthar
4, 5, 6. Tevaram	Appar
7. Tirupaatu	Sundarar
8. Tiruvasakam and Tirukkovaiyar	Manikkavasakar
9. Tiruvisaippa & Tiruppallaandu	Various poets
10. Tirumandhiram	Tirumoolar
11. Prabandham	Various poets
12. Periya Puranam	Sekkizhar

The Shaiva Tirumurais are twelve in number. The first seven Tirumurais are the hymns of the three great Shaivite saints, Sambanthar, Appar and Sundarar. These hymns were the best musical compositions of their age.

• The first three Tirumurais are the extempore compositions of Thiru Gnana Sambanthar

• The fourth, the fifth and the sixth Tirumurais are those of Appar

• The seventh Tirumurai consists of saint Sundarar's hymns

• The eighth Tirumurai consists of saint Manikkavasagar's hymns

• The ninth Tirumurai has been composed by Tirumalikaittever, Centanar, Karuvurttevar, Nampikatava Nampi, Kantaratittar, Venattatikal, Tiruvaliyamutanar, Purutottama Nampi and Cetirayar

• The tenth Tirumurai has been composed by Tirumular

• The eleventh Tirumurai has been composed by Karaikkal Ammaiyar, Ceraman Perumal, Pattinattu p-pillaiyar, Nakkiratevar, Kapilateva, Tiruvalavaiyudaiyar, Nampiyantarnampi, Iyyadigal katavarkon, Kalladateva, Paranateva, Ellamperuman Adigal and Athirava Adigal

• The twelfth Tirumurai has been composed by Sekkizhar

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Pingree’s Views

Western scholars of the history of astronomy like David Pingree have accepted the astronomical basis of this hymn. In an article, "Astronomy in India" in Astronomy Before the Telescope, C. Walker (ed.), St. Martin's Press, New York, 1996, pps. 123-124, Pingree suggests that Mul. Apin, Babylonian tablets that date from 687 to 500 BC has "’an ideal calendar' in which one year contains 12 months, each of which has 30 days, and consequently exactly 360 days; a late hymn of the Rgveda refers to the same ‘ideal calendar’. And Mul.Apin describes the oscillation of the rising-point of the sun along the eastern horizon between its extremities when it is at the solstices; the same oscillation is described in the Aitareya Brahmana.’" This ideal calendar is the basis for the zodiac and its twelve signs at a mathematical level. Clearly Pingree is referring to Rig Veda I.164 as his ‘late’ hymn of the Rig Veda.

To quote from David Pingree’s "History of mathematical astronomy in India," in the Dictionary of Scientific Biography, C.S. Gillespie (ed.), pp. 533-633, Charles Scribners, New York, 1981, page 534: "In the case of the priority of the Rgveda to the brahmanas

One of the four natural divisions of society, which refers to the spiritualists. In later times it came to refer to a caste determined by birth.'); return false">brahmanas, it is not always clear that the views expressed in the latter developed historically after the composition of the former. All texts that can reasonably be dated before ca. 500 BC are here considered to represent essentially a single body of more or less uniform material." The point of his statement is to try to get such Rig Veda references as those of Dirghatamas later than the Brahmana texts as both reflect a similar sophisticated astronomy, which is necessary to make it later than the Babylonian references and a product of a Babylonian influence as he proposes. This requires reducing all the layers of Vedic literature to a more or less uniform mass at a very late date, which is contrary to almost every view of the text.

Clearly this Rig Veda hymn, which has parallels and developments in the Brahmanas (like the Shatapatha Brahmana quoted in this chapter), must be earlier and show that such ideas were much older than the Brahmanas. To maintain his late date for Vedic astrology, Pingree must assume that this hymn or its particular astronomical verses were late interpolations to the Rig Veda, around 500 BCE or about the time of the Buddha. This is rather odd because the Buddha is generally regarded as having come long after the Vedic period, while the actual text is usually dated well before 1000 BCE (some have argued even to 3000 BCE).

Even the Brahmanas, like the Upanishads that come after them, are pre-Buddhist by all accounts. Perhaps the main Vedic ritual given in the Brahmanas, the Gavamayana, follows the model of a year of 360 days and is divided into two halves based upon the solstices, showing that such an ‘ideal’ calendar was central to Vedic thought. That such an ideal calendar has its counterpart in the sky is well reflected in Vedic ideas saying that equate the days and nights with the Sun’s rays and with the stars (as we have noted in Shatapatha Brahmana with 720 Upanakshatras)*. The Brahmanas, we should also note, emphasize the Krittikas or the Pleiades as the first of the Nakshatras, reflecting an astronomical era of the Taurus equinox. The Shatapatha Brahmana notes that the Krittikas mark the eastern direction.

In addition, the hymn, its verses and commentaries on them are found in many places in Vedic literature, along with support references to Nakshatras. It cannot be reduced to a late addition but is an integral part of the text.

That being the case, a zodiac of 360 degrees and its twelvefold division are much older in India than any Greek or even Babylonian references that he has come up with.

Pingree also tries to reduce the ancient Vedic calendar work Vedanga Jyotish to 500 BCE or to a Babylonian influence. However, the internal date of this late Vedic text is of a summer solstice in Aslesha or 1300 BCE, information referenced by Varaha Mihira in his Brihat Samhita (III.1-2). "There was indeed a time when the Sun’s southerly course (summer solstice) began from the middle of the Nakshatra Aslesha and the northerly one (winter solstice) from the beginning of the Nakshatra Dhanishta. For it has been stated so in ancient works. At present the southerly course of the Sun starts from the beginning of Cancer and the other from the initial point of the sign Capricorn." The middle of Aslesha is 23 20 Cancer, while the beginning of Dhanishta (Shravishta) is 23 20 Capricorn. Calculating the precession accordingly, this is obviously a date of around 1300 BCE.

There are yet earlier references in the Vedas like Atharva Veda XIX.6.2 that starts the Nakshatras with Krittika (the Pleiades) and places the summer solstice (ayana) in Magha (00 - 13 20 Leo), showing a date before 1900 BCE. These I have examined in detail in my book Gods, Sages and Kings (Lotus Press). Clearly the Vedas show the mathematics for an early date for the zodiac as well as the precessional points of these eras long before the Babylonians or the Greeks supposedly gave them the zodiac.

It is not surprising that India could have invented the zodiac and circle of 360 degrees. After all, the decimal system and the use of zero came from India. In this regard, as early as the Yajur Veda, we find names for numbers starting with one, ten, one hundred and one thousand ending with one followed by twelve zeros (Shukla Yajur Veda XVII.2).

The Rig Veda has another cryptic verse that suggests its cosmic numerology. According to it the Cosmic Bull has four horns, three feet, two heads and seven hands (Rig Veda IV.58.3). This sounds like a symbolic way of presenting the great kalpa number of 4,320,000,000 years. Such large numbers for the universe are typical to Indian thought, but scholars such as Pingree would also ascribe them to a Babylonian origin. However, the literature suggests the opposite.

According to Dirghatamas Rig Veda I.155.6, "With four times ninety names (caturbhih sakam navatim ca namabhih), he (Vishnu) sets in motion moving forces like a turning wheel (cakra)." This suggests that even in Vedic times Vishnu had 360 names or forms, one for each degree of the zodiac. A fourfold division may correspond to the solstices and equinoxes. Elsewhere Dirghatamas states, I.164.36, "Seven half embryos form the seed of the world. They stand in the dharma by the direction of Vishnu." This probably refers to the seven planets.

Most of the astronomical information occurs in his famous Asya Vamasya Hymn I.164. Much of this hymn can be understood as a description of the zodiac. It begins:

This verse is referring to the usual threefold Vedic division of Gods and worlds as the Fire (Agni) on Earth, the Wind or Lightning (Vayu) in the Atmosphere and the Sun (Surya) in Heaven. This also may refer to the three steps or strides of Vishnu through which he measures the Earth, the Atmosphere and Heaven. The Sun is also a symbol of the supreme light or the supreme Sun God that is Vishnu. The Sun or supreme light has seven children, the visible Sun, Moon and five planets.

We should note that the zodiac of twelve signs is divided into three sections based upon a similar understanding, starting with Aries or fire (cardinal fire ruled by Mars, who in Vedic thought is the fire born of the Earth), then with Leo or the Sun (fixed fire ruled by the Sun), and then with Sagittarius, the atmospheric fire, lightning or wind (mutable fire ruled by Jupiter, the God of the rains).
The zodiac is the single wheeled-chariot or circle yoked by the seven planets which are all forms of the Sun or sunlight. It is the wheel of time on which all beings are placed. The Vedic horse (ashva) is symbolic of energy or propulsive force.
The seven planets create their seven rotations or seven wheels. Each has its horse, its energy or velocity. Each has its feminine power or sister, its power of expression. It carries its own hidden name or secret knowledge (symbolically cows or rays). This refers to the astrological influences of the planets.
The circle of the zodiac has twelve signs. It has 720 half degrees or twins, making 360 total. The Shatapatha Brahmana X.5.5, a late Vedic text, also speaks of a wheel of heaven with 720 divisions. "But indeed that Fire-altar is also the Nakshatras. For there are twenty seven of these Nakshatras and twenty-seven secondary Nakshatras. This makes 720." Twenty-seven times twenty-seven Nakshatras equals 729, with which some overlap can be related to the 720 half-degrees of the zodiac.
The five feet of the father or the Sun are the five planets or the five elements that these often refer to (to which Vedic thought associates the five sense organs and five motor organs in the human body). His twelve forms are the twelve signs. The Sun in the higher half of heaven with the waters is the signs Leo with Cancer (ruled by the Moon), with the other five planets being the five feet, each ruling two signs. In Vedic thought, the Sun is the abode of the waters, which we can see in the zodiac by the proximity of the signs Cancer and Leo.

The sevenfold wheel is the zodiac moved by the seven planets. The six spokes are the six double signs through which the planets travel. The same verse occurs in the Prashna Upanishad I.11 as a symbol for the year.
The five-spoked wheel is again the zodiac ruled by five planets and five elements and their various internal and external correspondences.
This may again refer to the ten signs ruled by the five planets, with each planet ruling two signs. The eye of the Sun may be the sign Leo through which the solar influence pervades the zodiac or just the Sun itself. The upward extension may be the polar region.
The six born together or are twins are the twelve signs, two of which are ruled by one planet (considering the Sun and Moon as a single planetary influence). The seventh that is singly born is the single light that illumines all the planets. Elsewhere the Rig Veda X.64.3 speaks of the Sun and Moon as twins (yama) in heaven.

The planets are often associated with the rishis in Vedic thought, particularly the rishis Brihaspati (Jupiter), Shukra (Venus) and Kashyapa (the Sun) which became common names for the planets. Their ordainer or stabilizer may be the pole star (polar point).

Astrologers have not presented consistent explanations of physical mechanisms underlying astrological beliefs,^[75][76] and few modern astrologers believe in a direct causal relationship between heavenly bodies and earthly events.^[68] 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.^[8] Researchers have posited acausal, purely correlative, relationships between astrological observations and events, such as the theory of synchronicity proposed by Carl Jung.^[77] Others have posited a basis in divination.^[78] Others have argued that empirical correlations stand on their own epistemologically, and do not need the support of any theory or mechanism.^[70] 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.^[70] 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.^[79] Consequently, several astrologers have called for or advocated continuing studies of astrology based on statistical validation

Astrologers have argued that there are significant obstacles in carrying out scientific research into astrology today, including lack of funding,^[67][68] lack of background in science and statistics by astrologers,^[69] and insufficient expertise in astrology by research scientists and skeptics.^[67][68][70] 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.^[68][71]

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.^[72][73] 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.

Research

The Mars effect: relative frequency of the diurnal position of Mars in the birth chart of eminent athletes.

Studies have repeatedly failed to demonstrate statistically significant relationships between astrological predictions and operationally defined outcomes.^[8][58] 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.^[59] It has been suggested that other statistical research is often wrongly seen as evidence for astrology due to uncontrolled artifacts.^[60]

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.^[61] 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,^[62][63][64] and of studies in fringe journals used to support or expand the original ideas.^[65][66] Gauquelin's research has not received mainstream scientific notice.

In the Islamic world astrology was rejected during the turn of the 2nd millenium C.E. owing to the development of the scientific method and the work of al-Farabi, Alhacen, al-Biruni, Avicenna and Averroes, who made a semantic distinction between astronomy and astrology ^[44] and helped to render astrology obsolete for Muslims. Muslim views on astrology have generally remained negative.

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.^[45] 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."^[46] This separation accelerated through the eighteenth and nineteenth centuries.^[47]

Contemporary scientists, such as Richard Dawkins and Stephen Hawking, regard astrology as unscientific,^[48][49] and those such as Andrew Fraknoi of the Astronomical Society of the Pacific have labeled it a pseudoscience.^[50] 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".^[51] 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.^[52][53] 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.^[54]

Astrophysicist Neil deGrasse Tyson asserted that "astrology was discredited 600 years ago with the birth of modern science. 'To teach it as though you are contributing to the fundamental knowledge of an informed electorate is astonishing in this, the 21st century'. Education should be about knowing how to think, 'And part of knowing how to think is knowing how the laws of nature shape the world around us. Without that knowledge, without that capacity to think, you can easily become a victim of people who seek to take advantage of you'".^[55][56]

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, Geoffrey Dean, a former astrologer who became critical of the field, and coauthors documented this burgeoning research activity performed primarily within the astrological community

Astrology has had a profound influence over the past few thousand years on Western and Eastern cultures. In the Middle Ages, when the 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.^[34][35]

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.^[36]. The word "disaster" comes from the Italian disastro, derived from the negative prefix dis- and from Latin aster "star", thus meaning "ill-starred"^[37] 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^[38][39][40] and William Shakespeare,^[41][42] 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,^[43] 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.

Indian astrology uses a different zodiac than Western astrology and is a branch of Vedic science.^[28][29] 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.^[30][31] 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)^[32] 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.^[33]

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 popularized 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.^[28][29] 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.^[30][31] 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)^[32] 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.^[33]

The differentiation between astronomy and astrology varied from place to place; they were strongly linked in ancient India,^[22] ancient Babylonia and medieval Europe, but separated to an extent in the Hellenistic world. The first semantic distinction between astrology and astronomy was probably given by Isidore of Seville^[23] (see astrology and astronomy).

The pattern of astronomical knowledge gained from astrological endeavors 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.^[24] Ibn Qayyim Al-Jawziyya (1292–1350), in his Miftah Dar al-SaCadah, used empirical arguments in astronomy in order to refute astrology and divination.^[25]

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.

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 ὡροσκόπος (hōroskopos) from which horoscope derives. In modern times, the word has come to refer to the astrological chart as a whole.

Branches

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 characterize and describe major historical ages, as well as current developments in the world.

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 BC.^[19] 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.^[7] 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.

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.^[17] 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.^[18]

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); Hindu astrology and Mayan astrology.

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, the twelve zodiacal signs in Western astrology no longer correspond to the same part of the sky as their original constellations, due to centuries of change. In effect, in Western astrology the link between sign and constellation was 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 13⅓ 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 × 5) year cycle. The term Chinese astrology is used here for convenience, but it must be noted 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 orbits 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 first through 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.

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".^[14] 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.

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.

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^{[citation needed]}, the asteroids^{[citation needed]}, 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.^[15]

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,^[16] showing the changing zodiacal positions of the heavenly bodies through time.

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.^[1] Modern astrologers define astrology as a symbolic language,^[2][3][4] an art form, or a form of divination.^[5][6] 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.

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,^[7] 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.

Astrology is generally considered a pseudoscience or superstition by the scientific community, which cites a lack of statistically significant astrological predictions, while psychology explains much of the continued faith in astrology as a matter of cognitive biases.^{[8][9][10][11]} In 2006 the U.S. National Science Board published a statement which said it considers belief in ten survey items, astrology among them, to be "pseudoscientific".^[12]

The word "astrology" comes from the Latin term astrologia ("astronomy"),^[13] which in turn derives from the Greek noun αστρολογία: ἄστρον, astron ("constellation" or "star") and -λογία, -logia ("the study of")