For Vernal Equinox we have terms and definitions in 7 topics. The topics are Astrology, Astronomy, Atmospheric Chemistry, Climatology, Hunting, Physical Geography and Weather.

Spring Equinox (northern hemisphere). The first degree of Aries, the beginning of the astrological year, when the Sun crosses the celestial equator from south to north.
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The place in the sky where the Sun crosses the celestial equator moving northwards. The vernal equinox falls on, or near, March 21, the first day of spring. See celestial sphere for a helpful diagram.
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A time during the spring season when the sun is directly above the equator which results in an equal amount of time for day and night. [Journal of Applied Meteorology; v30n4; 494; 1991.] [Journal of Atmospheric and Terrestrial Physics; v51n2; 111; 1989.]
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The equinox when the sun approaches the Northern Hemisphere; typically called the first day of spring
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See equinoxes
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One of the two periods when the declination of the sun is at the equator. The vernal equinox occurs on March 20 or 21.
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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.
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