Vernal Equinox

Science / Weather / Vernal Equinox: Taking place in the Northern Hemispheric spring, it is the point at which the ecliptic intersects the celestial equator. Days and nights are most nearly equal in duration. It falls on or about March 20 and is considered the beginning of spring in the Northern Hemisphere and autumn in the Southern Hemisphere. It is the astronomical opposite of the autumnal equinox.

Equinoxes

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 MORE

Equinox

Science / Astrology / Equinox: From the Latin aequinoctium, equal night; occurs when the center of the Sun is directly over Earth's equator. The Sun crosses the equator twice each year, once at the vernal equinox when it enters 0° MORE

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

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