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See also: Signs of the Zodiac (table)Signs of the Zodiac
Constellation English Name Symbol Dates
Aries The Ram ♈ Mar. 21–Apr. 19
Taurus The Bull ♉ Apr. 20–May 20
Gemini The Twins ♊ May 21–June 21
Cancer The Crab ♋ June 22–July 22
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(zō`dēăk) [Gr. zoion=animal], in astronomy, zone of the sky that includes about 8° on either side of the eclipticecliptic
, the great circle on the celestial sphere that lies in the plane of the earth's orbit (called the plane of the ecliptic). Because of the earth's yearly revolution around the sun, the sun appears to move in an annual journey through the heavens with the ecliptic as its
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. The apparent paths of the sun, the moon, and the major planets all fall within this zone. The zodiac is divided into 12 equal parts of 30° each, each part being named for a constellation, each of which is represented by a sign and many of which have animal names. The constellations and their corresponding symbols and dates are listed in the table entitled The Signs of the ZodiacSigns of the Zodiac
Constellation English Name Symbol Dates
Aries The Ram ♈ Mar. 21–Apr. 19
Taurus The Bull ♉ Apr. 20–May 20
Gemini The Twins ♊ May 21–June 21
Cancer The Crab ♋ June 22–July 22
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. The zodiac serves as a convenient means of indicating the positions of the heavenly bodies. When the constellations of the zodiac were named about 2,000 years ago, the vernal equinox coincided with the beginning of the constellation Aries. For this reason, the first 30° section of the zodiac is called Aries; it extends eastward 30° from the vernal equinoxequinox
, either of two points on the celestial sphere where the ecliptic and the celestial equator intersect. The vernal equinox, also known as "the first point of Aries," is the point at which the sun appears to cross the celestial equator from south to north.
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, which is therefore called the first point of Aries. However, because of the precession of the equinoxesprecession of the equinoxes,
westward motion of the equinoxes along the ecliptic. This motion was first noted by Hipparchus c.120 B.C. The precession is due to the gravitational attraction of the moon and sun on the equatorial bulge of the earth, which causes the earth's axis to
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, the vernal equinox has moved westward about 30° and now lies in the constellation Pisces; the zodiacal constellations thus no longer correspond to the segments of the zodiac represented by their signs. The constellations will again coincide with the sections of the zodiac in about 25,800 years. The zodiac probably had its origins among the Assyrians or Chaldaeans, although it may have originated among the Babylonians as early as 2000 B.C. It is of importance in astrologyastrology,
form of divination based on the theory that the movements of the celestial bodies—the stars, the planets, the sun, and the moon—influence human affairs and determine the course of events.
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The imaginary band of the celestial sphere on either side of the yearly path of the sun, moon, and stars, divided since Babylonian times into 12 segments named after the 12 constellations, each with its own symbol.
Enlarge picture
The zodiacal calendar, this one adorns the Bracken House in London. Reproduced by permission of Fortean Picture Library.


(religion, spiritualism, and occult)

The zodiac (literally, “circle of animals,” or, in its more primary meaning, the “circle of life” or “circle of living beings”) is the “belt” constituted by the 12 signs—Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. This belt is said to extend 8° or 9° on either side of the ecliptic (the imaginary line drawn against the backdrop of the stars by the orbit of Earth). The orbits of the various planets in the solar system all lie within approximately the same geometric plane, so from a position within the system, all the heavenly bodies appear to move across the face of the same set of constellations. Several thousand years ago, the names of these constellations became the basis for the zodiac.

A distinction must be drawn between the sidereal zodiac and the tropical zodiac. The sidereal zodiac is located more or less where the constellations are positioned. The other zodiac originated with Ptolemy, the great astrologer-astronomer of antiquity, who was very careful to assert that the zodiac should begin (i.e., 0° Aries should be placed) at the point where the Sun is positioned during the spring equinox. Because of the phenomenon known as the precession of equinoxes, this point very gradually moves backward every year, and currently 0° Aries is located near the beginning of the constellation Pisces. Astrologers who adhere to the Ptolemaic directive—the great majority of modern, Western astrologers—use the tropical zodiac (also called the moving zodiac, for obvious reasons). If the tropical zodiac is used, it should always be carefully distinguished from the circle of constellations (i.e., from the sidereal zodiac).

The notion of the zodiac is ancient, with roots in the early cultures of Mesopotamia; the first 12-sign zodiacs were named after the gods of these cultures. The Greeks adopted astrology from the Babylonians; the Romans, in turn, adopted astrology from the Greeks. These peoples renamed the signs of the Babylonian zodiac in terms of their own mythologies, which is why the familiar zodiac of the contemporary West bears names out of Mediterranean mythology. The notion of a 12-fold division derives from the lunar cycle (the orbital cycle of the Moon around Earth), which the Moon completes 12 times per year.

From a broad historical perspective, zodiacal symbolism can be found everywhere, and zodiacal expressions are still in use in modern English—e.g., bullheaded (an allusion to Taurus), crabby (an allusion to Cancer), etc. Throughout the centuries people have drawn parallels between the zodiac and many other 12-fold divisions—such as the Twelve Labors of Hercules, the Twelve Disciples, and the Twelve Tribes of Israel. The popularity of sun-sign astrology (the kind found in the daily newspaper) has kept these ancient symbols alive in modern society, and even such prominent artifacts as automobiles have been named after some of the signs (e.g., the Taurus and the Scorpio).


Cirlot, Juan Eduardo. A Dictionary of Symbols. London: Routledge & Kegan Paul, 1971.
Gettings, Fred. Dictionary of Astrology. London: Routledge & Kegan Paul, 1985.
Tester, Jim. A History of Western Astrology. New York: Ballantine, 1987.



(Greek zodiakos, from zoon —animal), the 12 constellations (Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces) situated along the sun’s apparent yearly path among the stars (the ecliptic). The name “zodiac” is connected with the fact that the most of the zodiacal constellations even in ancient times bore the names of animals. The apparent path of the planets of the solar system and the moon also passes through the zodiacal constellations.

In ancient Greece the constellations of the zodiac had al-ready been distinguished into a special group, and each of them was given its own astronomical symbol. The points of the vernal equinox (constellation Aries), the autumnal equinox (Libra), the summer solstice (Cancer), and the winter solstice (Capricorn) were designated by the symbols of the corresponding constellations. Because of precession, these points have shifted during the past 2,000 years from the constellations mentioned above; however, the designations that were given to them by the ancient Greeks have been preserved. Also retained are the names tropic of Cancer (northern tropic) and tropic of Capricorn (southern tropic), which corresponded to the summer and winter solstices in that period. The constellations Scorpio and Sagittarius are visible in the southern regions of the USSR; the rest are visible throughout its territory.


What does it mean when you dream about the zodiac?

This spherical symbol of the astrological signs that bear the names of the constellations could be an indication that one’s subconscious is guiding one to investigate astrology, or to have a chart cast by an astrologer—especially if this dream occurs around one’s birthday. Alternatively, it could also represent a sense of feeling fated or even fatalistic.


A band of the sky extending 8° on each side of the ecliptic, within which the moon and principal planets remain.


See also Astrology.
water-bearer (Jan. 20–Feb. 18). [Astrology: Hall, 314]
ram (Mar. 21–Apr. 19). [Astrology: Hall, 314]
crab (June 21–July 22). [Astrology: Hall, 314]
goat (Dec. 22–Jan. 19). [Astrology: Hall, 315]
twins (May 21–June 20). [Astrology: Hall, 314]
lion (July 23–Aug. 22). [Astrology: Hall, 315]
balance (Sept. 23–Oct. 22). [Astrology: Hall, 315]
fishes (Feb. 19-Mar. 20). [Astrology: Hall, 314]
archer (Nov. 22–Dec. 21). [Astrology: Hall, 315]
scorpion (Oct. 23–Nov. 21). [Astrology: Hall, 315]
bull (Apr. 20–May 20). [Astrology: Hall, 314]
virgin (Aug. 23–Sept. 22). [Astrology: Hall, 315]


1. an imaginary belt extending 8? either side of the ecliptic, which contains the 12 zodiacal constellations and within which the moon and planets appear to move. It is divided into 12 equal areas, called signs of the zodiac, each named after the constellation which once lay in it
2. Astrology a diagram, usually circular, representing this belt and showing the symbols, illustrations, etc., associated with each of the 12 signs of the zodiac, used to predict the future