Science / Tides and Currents / Equinoxes: The two points in the celestial sphere where the celestial equator intersects the ecliptic; also, the times when the Sun crosses the equator at these points. The vernal equinox is the point where the Sun crosses the Equator from south to north and it occurs about March 21. Celestial longitude is reckoned eastward from the vernal equinox. The autumnal equinox is the point where the Sun crosses the Equator from north to south and it occurs about September 23.
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Precession Of The Equinoxes

Science / Astrology / Precession Of The Equinoxes: The gradual westward shift (about 50' each year) of the equinoctial points along the ecliptic due to the ecliptic due to the rotational movement of the poles of Earth's axis. This phenomena creates an MORE

Tropical Zodiac

Science / Astrology / Tropical Zodiac: The circle of signs that follows the apparent path of the Sun (ecliptic). Also called the movable zodiac because it shifts slightly each year relative to the constellations of the sidereal zodiac. See MORE

Ptolemy, Claudius

Science / Astrology / Ptolemy, Claudius: A great astrologer, astronomer and geographer of the second century (ca. 100-178 A.D.) who developed the theory that Earth is the motionless center of the universe about which the planets, sun and Moo MORE