Astrological sign

The twelve ecliptic signs. Each dot marks the start of a sign and they are separated by 30°. The intersection of the celestial equator and the ecliptic define the equinoctial points: First Point of Aries () and First Point of Libra (). The great circle containing the celestial poles and the ecliptic poles (P and P'), intersect the ecliptic at 0° Cancer () and 0° Capricorn (). In this illustration, the Sun is schematically positioned at the start of Aquarius ().

Western astrology is a direct continuation of Hellenistic astrology as recorded by Ptolemy in the 2nd century. Hellenistic astrology in turn was partly based on concepts from Babylonian tradition. Specifically, the division of the ecliptic in twelve equal sectors is a Babylonian conceptual construction.[6]

By the 4th century BC, Babylonian astronomy and its system of celestial omens had an influence on the culture of ancient Greece, as did the astronomy of Egypt by late 2nd century BC. This resulted, unlike the Mesopotamian tradition, in a strong focus on the birth chart of the individual and in the creation of Horoscopic astrology, employing the use of the Ascendant (the rising degree of the ecliptic, at the time of birth), and of the twelve houses. Association of the astrological signs with Empedocles' four classical elements was another important development in the characterization of the twelve signs.

The body of the Hellenistic astrological tradition as it stood by the 2nd century is described in Ptolemy's Tetrabiblos. This is the seminal work for later astronomical tradition not only in the West but also in India and in the Islamic sphere, and has remained a reference for almost seventeen centuries as later traditions made few substantial changes to its core teachings.

The following table enumerates the twelve divisions of celestial longitude, with the Latin names (still widely used) and the English translation (gloss), which express the constellation they are named for. The longitude intervals, are treated as closed for the first endpoint (a) and open for the second (b) – for instance, 30° of longitude is the first point of Taurus, not part of Aries. The sign numbers, 0 through 11, are seen instead of the symbols in some astronomical works.

Any association of calendar dates with these signs only makes sense when referring to Sun sign astrology.

Sign	Symbol	Number	Ecliptic longitude (a ≤ λ < b)	Gloss
Aries		0	0° to 30°	The Ram
Taurus		1	30° to 60°	The Bull
Gemini		2	60° to 90°	The Twins
Cancer		3	90° to 120°	The Crab
Leo		4	120° to 150°	The Lion
Virgo		5	150° to 180°	The Maiden
Libra		6	180° to 210°	The Scales
Scorpio		7	210° to 240°	The Scorpion
Sagittarius		8	240° to 270°	The Archer (Centaur)
Capricorn		9	270° to 300°	The Goat
Aquarius		10	300° to 330°	The Water-bearer
Pisces		11	330° to 360°	The Fish

A simple diagram displaying the planets' sign positions on May 16th, 2012. The signs are colored according to the associated element. Each planet is represented by a glyph next to its longitude within the sign. Additional symbols may be added to represent apparent retrograde motion (), or apparent stationary moment (shift from retrograde to direct, or vice versa: S).

Empedocles, a fifth-century BC Greek philosopher, identified Fire, Earth, Air, and Water as elements. He explained the nature of the universe as an interaction of two opposing principles called love and strife manipulating the four elements, and stated that these four elements were all equal, of the same age, that each rules its own province, and each possesses its own individual character. Different mixtures of these elements produced the different natures of things. Empedocles said that those who were born with near equal proportions of the four elements are more intelligent and have the most exact perceptions.[7]

Each sign is associated with one of the classical elements (fire, air, earth, and water),[8][9] and these can also be grouped according to polarity (positive or negative): Fire and Air signs are considered positive signs while Water and Earth signs are considered negative signs. The four astrological elements are also considered as a direct equivalent to Hippocrates' personality types (sanguine = air; choleric = fire; melancholic = earth; phlegmatic = water). A modern approach looks at elements as "the energy substance of experience"[10] and the next table tries to summarize their description through keywords.[11][12]

Polarity	Element	Symbol[13]	Keywords	Signs
Positive (Male) (self-expressive)	Fire		Assertion, drive, willpower	Aries, Leo, Sagittarius
	Air		Communication, socialization, conceptualization	Gemini, Libra, Aquarius
Negative (Female) (self-containing)	Earth		Practicality, caution, material world	Taurus, Virgo, Capricorn
	Water		Emotion, empathy, sensitivity	Cancer, Scorpio, Pisces

Classification according to element has gained such importance, that some astrologers start their interpretation of a natal chart, by studying the balance of elements shown by the position of planets and angles[14] (especially the Sun, the Moon and the Ascendant signs).

Each of the four elements manifests in three modalities: Cardinal, Fixed and Mutable.[15] As each modality comprehends four signs, these are also known as Quadruplicities.[8][9]

Modality	Symbol[16]	Keywords[17][18]	Signs
Cardinal		Action, dynamic, initiative, great force	Aries, Cancer, Libra, Capricorn
Fixed		Resistance to change, great willpower, inflexible	Taurus, Leo, Scorpio, Aquarius
Mutable		Adaptability, flexibility, resourcefulness	Gemini, Virgo, Sagittarius, Pisces

The combination of element and modality provides a basic sign characterization. For instance, Capricorn is a cardinal earth sign, meaning that it is associated with action (cardinal modality) in the material world (earth element).[19] The next table displays the twelve combinations of elements and modalities.

Representation of the western astrological signs in a 1716 Acta Eruditorum table illustration

Rulership is the connection between planet and correlated sign and house.[20] The traditional rulerships are as follows: Aries (Mars), Taurus (Venus), Gemini (Mercury), Cancer (Moon), Leo (Sun), Virgo (Mercury), Libra (Venus), Scorpio (Pluto), Sagittarius (Jupiter), Capricorn (Saturn), Aquarius (Uranus), and Pisces (Neptune).[21][22]

Psychologically-oriented astrologers often believe that Saturn is the ruler or co-ruler of Aquarius instead of Uranus; Neptune is the ruler or co-ruler of Pisces instead of Jupiter, and that Pluto is the ruler or co-ruler of Scorpio instead of Mars. Some astrologers[23] believe that the planetoid Chiron may be the ruler of Virgo, while other group of modern astrologers claim that Ceres is the ruler of Taurus instead.

The following table shows both traditional[21] and modern[24] rulerships.

Symbol	Unicode Char	Sign names	Dates	Ruling celestial body Modern	Ruling celestial body Classical
	♈	Aries	March 21 – April 20	Mars	Mars
	♉	Taurus	April 21 – May 20	Venus	Venus
	♊	Gemini	May 21 – June 21	Mercury	Mercury
	♋	Cancer	June 22 – July 22	Moon	Moon
	♌	Leo	July 23 – August 23	Sun	Sun
	♍	Virgo	August 23 – September 21	Mercury	Earth
	♎	Libra	September 22 – October 22	Venus	Venus
	♏	Scorpio	October 23 – November 21	Pluto	Mars
	♐	Sagittarius	November 22 – December 21	Jupiter	Jupiter
	♑	Capricorn	December 22 – January 20	Saturn	Saturn
	♒	Aquarius	January 21 – February 19	Uranus	Saturn
	♓	Pisces	February 20 – March 20	Neptune	Jupiter

The twelves signs each have opposites, resulting in six opposite couples. Fire and Air elements are opposites and Earth and Water elements are opposites.[25] Spring signs are opposite to autumn ones, and winter signs are opposite to summer ones.[26][27][28][29]

• Aries is opposite to Libra
• Cancer is opposite to Capricorn
• Gemini is opposite to Sagittarius
• Pisces is opposite to Virgo
• Taurus is opposite to Scorpio
• Leo is opposite to Aquarius

A traditional belief of astrology, known as essential dignity, is the idea that the Sun, Moon and planets are more powerful and effective in some signs than others, because the basic nature of both is held to be in harmony. By contrast, they are held to find some signs to be weak or difficult to operate in because their natures are thought to be in conflict. These categories are Dignity, Detriment, Exaltation and Fall.

• Dignity and Detriment: A planet is strengthened or dignified if it falls within the sign that it rules. In other words, it is said to exercise Rulership of the sign. For example, the Moon in Cancer is considered "strong" (well-dignified). If a planet is in the sign opposite which it rules (or is dignified in), it is said to be weakened or in Detriment (for example, the Moon in Capricorn).[30]

In traditional astrology, other levels of Dignity are recognised in addition to Rulership. These are known as Exaltation, Triplicity, Terms or bounds, and Face or Decan, which together are known as describing a planet's Essential dignity, the quality or ability of one's true nature.[30]

• Exaltation and Fall: In addition, a planet is also strengthened when it is in its sign of Exaltation. In traditional horary astrology, Exaltation denotes a level of dignity somewhat exaggerated compared to rulership. Exaltation was considered to give the planet (or what it signified in a horary chart) dignity, with the metaphor of an honoured guest – who is the centre of attention but the extent of their ability to act is limited. Examples of planets in their Exaltation are: Saturn (Libra), Sun (Aries), Venus (Pisces), Moon (Taurus), Mercury (Virgo, although some disagree to this classification), Mars (Capricorn), Jupiter (Cancer). A planet in the opposite sign of its Exaltation is said to be in its Fall, and thus weakened, perhaps seemingly more so than Detriment.[30] There is no agreement as to the signs in which the three extra-Saturnian planets may be considered to be exalted.[31]

The following table summarizes the positions described above:

Planet (Symbol)	Dignity	Detriment	Exaltation	Fall
Sun ()	Leo	Aquarius	Aries	Libra
Moon ()	Cancer	Capricorn	Taurus	Scorpio
Mercury ()	Gemini and Virgo	Sagittarius and Pisces	Virgo	Pisces
Venus ()	Libra and Taurus	Aries and Scorpio	Pisces	Virgo
Mars ()	Aries and Scorpio	Libra and Taurus	Capricorn	Cancer
Jupiter ()	Sagittarius and Pisces	Gemini and Virgo	Cancer	Capricorn
Saturn ()	Capricorn and Aquarius	Cancer and Leo	Libra	Aries
Earth	Virgo	Scorpio	Leo	Cancer

In addition to essential dignity, the traditional astrologer considers Accidental dignity of planets. This is placement by house in the chart under examination. Accidental dignity is the planet's "ability to act." So we might have, for example, Moon in Cancer, dignified by rulership, is placed in the 12th house it would have little scope to express its good nature.[32] The 12th is a cadent house as are the 3rd, 6th and 9th and planets in these houses are considered weak or afflicted. On the other hand, Moon in the 1st, 4th, 7th or 10th would be more able to act as these are Angular houses. Planets in Succedent houses of the chart (2nd, 5th, 8th, 11th) are generally considered to be of medium ability to act. Besides Accidental Dignity, there are a range of Accidental Debilities, such as retrogradation, Under the Sun's Beams, Combust, and so forth.

Each sign can be divided into three 10° sectors known as decans or decanates, though these have fallen into disuse. The first decanate is said to be most emphatically of its own nature and is ruled by the sign ruler.[33] The next decanate is sub-ruled by the planet ruling the next sign in the same triplicity. The last decanate is sub-ruled by the next in order in the same triplicity.[34]

While the element and modality of a sign are together sufficient to define it, they can be grouped to indicate their symbolism. The first four signs, Aries, Taurus, Gemini and Cancer, form the group of personal signs. The next four signs, Leo, Virgo, Libra and Scorpio form the group of interpersonal signs. The last four signs of the zodiac, Sagittarius, Capricorn, Aquarius and Pisces, form the group of transpersonal signs.[35]

Dane Rudhyar presented the tropical zodiac primary factors,[36] used in the curriculum of the RASA School of Astrology. The tropical zodiac is the zodiac of seasonal factors as opposed to the sidereal zodiac (constellation factors). The primary seasonal factors are based on the changing ratio of sunlight and darkness across the year. The first factor is whether the chosen time falls in the half of the year when daylight is increasing, or the half of the year when darkness is increasing. The second factor is whether the chosen time falls in the half of the year when there is more daylight than darkness, or the half when there is more darkness than daylight. The third factor is which of the four seasons the chosen time falls in, defined by the first two factors. Thus[37][38]

• The winter season is when daylight is increasing and there is more darkness than daylight.
• The spring season is when daylight is increasing and there is more daylight than darkness.
• The summer season is when darkness is increasing and there is more daylight than darkness.
• The autumn season is when darkness is increasing and there is more darkness than daylight.

A nakshatra (Devanagari: नक्षत्र, Sanskrit nakshatra, from naksha- 'map', and tra- 'guard'), or lunar mansion, is one of the 27 divisions of the sky identified by the prominent star(s), as used in Hindu astronomy and astrology (Jyotisha).[40] "Nakshatra" in Sanskrit and Tamil means a "star."

The following table shows the twelve signs and their attributes.

Chart showing the 24 cardinal directions and the symbols of the sign associated with them.

In Chinese astrology, the zodiac of twelve animal sign represents twelve different types of personality. The zodiac traditionally begins with the sign of the Rat, and there are many stories about the Origins of the Chinese Zodiac which explain why this is so. When the twelve zodiac signs are part of the 60-year calendar in combination with the four elements, they are traditionally called the twelve Earthly Branches. The Chinese zodiac follows the lunisolar Chinese calendar[42] and thus the "changeover" days in a month (when one sign changes to another sign) vary each year. The following are the twelve zodiac signs in order.[43]

1. 子 Rat (Yang, 1st Trine, Fixed Element Water): Rat years include 1900, 1912, 1924, 1936, 1948, 1960, 1972, 1984, 1996, 2008, 2020, 2032. The Rat also corresponds to a particular month in the year. The hours of the Rat are 11pm – 1am.
2. 丑 Ox (Yin, 2nd Trine, Fixed Element Earth:[44] Ox years include 1901, 1913, 1925, 1937, 1949, 1961, 1973, 1985, 1997, 2009, 2021, 2033. The Ox also corresponds to a particular month in the year. The hours of the Ox are 1am – 3am.
3. 寅 Tiger (Yang, 3rd Trine, Fixed Element Wood): Tiger years include 1902, 1914, 1926, 1938, 1950, 1962, 1974, 1986, 1998, 2010, 2022, 2034. The Tiger also corresponds to a particular month in the year. The hours of the Tiger are 3am – 5am.
4. 卯 Rabbit (Yin, 4th Trine, Fixed Element Wood): Rabbit Years include 1903, 1915, 1927, 1939, 1951, 1963, 1975, 1987, 1999, 2011, 2023, 2035. The Rabbit also corresponds to a particular month in the year. The hours of the Rabbit are 5am – 7am.
5. 辰 Dragon (Yang, 1st Trine, Fixed Element Earth[44]): Dragon years include 1904, 1916, 1928, 1940, 1952, 1964, 1976, 1988, 2000, 2012, 2024, 2036. The Dragon also corresponds to a particular month in the year. The hours of the Dragon are 7am – 9am.
6. 巳 Snake (Yin, 2nd Trine, Fixed Element Fire): Snake years include 1905, 1917, 1929, 1941, 1953, 1965, 1977, 1989, 2001, 2013, 2025, 2037. The Snake also corresponds to a particular month in the year. The hours of the Snake are 9am – 11am.
7. 午 Horse (Yang, 3rd Trine, Fixed Element Fire): Horse years include 1906, 1918, 1930, 1942, 1954, 1966, 1978, 1990, 2002, 2014, 2026, 2038. The Horse also corresponds to a particular month in the year. The hours of the Horse are 11am – 1pm.
8. 未 Goat (Yin, 4th Trine, Fixed Element Earth[44]): Goat years include 1907, 1919, 1931, 1943, 1955, 1967, 1979, 1991, 2003, 2015, 2027, 2039. The Goat also corresponds to a particular month in the year. The hours of the Goat are 1pm – 3pm.
9. 申 Monkey (Yang, 1st Trine, Fixed Element Metal): Monkey years include 1908, 1920, 1932, 1944, 1956, 1968, 1980, 1992, 2004, 2016, 2028, 2040. The Monkey also corresponds to a particular month in the year. The hours of the Monkey are 3pm – 5pm.
10. 酉 Rooster (Yin, 2nd Trine, Fixed Element Metal): Rooster years include 1909, 1921, 1933, 1945, 1957, 1969, 1981, 1993, 2005, 2017, 2029, 2041. The Rooster also corresponds to a particular month in the year. The hours of the Rooster are 5pm – 7pm.
11. 戌 Dog (Yang, 3rd Trine, Fixed Element Earth[44]): Dog years include 1910, 1922, 1934, 1946, 1958, 1970, 1982, 1994, 2006, 2018, 2030, 2042. The Dog also corresponds to a particular month in the year. The hours of the Dog are 7pm – 9pm.
12. 亥 Pig (Yin, 4th Trine, Fixed Element Water): Pig years include 1911, 1923, 1935, 1947, 1959, 1971, 1983, 1995, 2007, 2019, 2031, 2043. The Pig also corresponds to a particular month in the year. The hours of the Pig are 9pm – 11pm.

• Wood: The wood person has high morals, is self-confident, expansive and co-operative, with wide and varied interests and idealistic goals. The direction associated with Wood is East, and the season is spring, which makes it the fixed element for the animal signs Tiger and Rabbit.[44]
• Fire: The fire person has leadership qualities, dynamic passion, and is decisive, self-confident, positive and assertive. The direction associated with Fire is South, and the season is summer, which makes it the fixed element for the animal signs Snake and Horse.[44]
• Earth: The earth person is serious, logical and methodical, intelligent, objective and good at planning. The direction associated with Earth is Center. The season for Earth is the changeover point of the four seasons. It is the fixed element for the animal signs Ox, Dragon, Goat and Dog.[44]
• Metal: The metal person is sincere, has fixed values and opinions, is strong of will, and has eloquence of speech. The direction associated with Metal is West. The season for Metal is Autumn. It is the fixed element for the animal signs Monkey and Rooster.[44]
• Water: The water person is persuasive, intuitive, and empathetic. The water person is objective and often sought out for their counsel. The direction associated with water is North. The season for Water is Winter. It is the fixed element for the animal signs Rat and Pig.[44]

The five elements operate together with the twelve animal signs in a 60-year calendar. The five elements appear in the calendar in both their yin and yang forms and are known as the ten Celestial stems. When trying to calculate the relevant year of the cycle in relation to the Gregorian calendar, an easy rule to follow is that years that end in an even number are Yang (representing masculine, active and light), those that end with an odd number are Yin (representing feminine, passive and darkness).[44]