Zodiac

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Categories: Astrology | Astrological terms

A 16th c. woodcut detail showing the symbolic glyphs of the twelve Zodiacal signs and their seven planetary rulers

The Zodiac (Gk. zoidiakos, or "circle of images of living things") refers to the twelve constellations that fall on the plane of the ecliptic (the path the sun takes across the sky over the course of the year).

In Western astrology, 12 such signs are recognized, each occupying a 30° segment of ecliptic longitude. Starting with the vernal point and moving eastward, these are: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces.

Table of contents

1 The Tropical and Sidereal Zodiacs

2 General meaning

3 Other Zodiacs

4 See also

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The Tropical and Sidereal Zodiacs

About two millennia ago, these signs lined up neatly with the constellations of the same names. However, thanks to the precession of the equinoxes, the signs have moved about 25° west with respect to the fixed stars. For example, the Sun enters the sign of Aries (by definition) at the Vernal Equinox, on approximately March 20, but does not enter the constellation of Aries—the pattern of fixed stars with that name—until roughly April 14. Because it is tied to the seasons rather than the stars, the conventional Western zodiac is also called the "tropical" zodiac (the sun moves between the Tropics of Cancer and Capricorn at the equinoces).

Some Western astrologers use an alternative zodiac which is fixed relative to the stars rather than the seasons. This "sidereal" zodiac drifts further out of alignment with the tropical zodiac by about a degree every 72 years. Unlike in the tropical zodiac, in the sideral zodiac the vernal point moves from sign to sign as precession occurs; currently it is in the westernmost part of sidereal Pisces, and moving steadily further westward. In about three and a half centuries, it will cross into sidereal Aquarius; this is what is meant by the "Age of Aquarius", and incidentally why we are said to be in "the dawning" of that age rather than the age itself.

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General meaning

Aries—"I want," action oriented, pioneering, assertive, enthusiasm, competitive
Taurus—"I have," sensual, cautious, stubborn, physical
Gemini—"I think," curious, talkative, sociable, duality, mercurial, intelligent
Cancer—"I feel," sensitive, tenacious, family and home oriented, helpful, nurturing, moody
Leo— "I am," passionate, dramatic, independent, noble, leader, egotistical, selfish
Virgo—"I serve," practical, analytical, work and service oriented, critical, common sense, orderly
Libra—"We are," partnerships, balance, grace, charm, cooperative, social, ideas, lazy, kidneys/lumbar
Scorpio—"I desire," intense, controlling, sexual, compulsive, deep, secretive, mysterious, obsessive
Sagittarius—"I seek," philosophic, fun-loving, adventurous, blundering, wanderlust, scattered
Capricorn—"I build," ambitious, cautious, authoritative, cunning, competent, stable, saturnine
Aquarius—"I know," friendships, cause-oriented, the group, society, progressive, eccentric, aloof
Pisces—"I believe," feeling, duality, spirituality, soul growth, suffering, artistic, overly emotional

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Other Zodiacs

Nearly every culture has an astrological system of one kind or another. Many of those of the Old World are noticeably related thanks to centuries of cultural diffusion; for example, the European system shows clear borrowings from Egyptian, Persian, and Indian lore. Interestingly, both the Mayan and some Hindu systems are sidereal rather than tropical; indeed, the word "ayanamsa" is borrowed from the Hindu Vedic system to name the angular difference at any given time between the sidereal and tropical coordinate systems.

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