For Equinox we have terms and definitions in 7 topics. The topics are Astrology, Atmospheric Chemistry, Climatology, Oceanography, Physical Geography, Solar Energy and Weather.

Equinox (Astrology)

Equal Night. Point in the ecliptic where the day and night is of equal duration. Vernal equinox is the first degree of Aries and the autumnal equinox is the first degree of Libra (these points are reversed in the southern hemisphere).

Equinox (Atmospheric Chemistry)

Twice during the year, September 21 and March 21, the length of day and night are equal because the tilt of the Earth's axis (in relationship to the sun) is nullified and both the Northern and Southern Hemispheres receive equal quantities of sunlight. An animation showing this is here. [Natural History; v103, 26-27; 1994.] [Astronomy; v20, 52-54; year?.]

Equinox (Climatology)

The time when the sun crosses the equator and day and night are everywhere of equal length

Equinox (Oceanography)

The two times of year when the sun's position makes day and night of equal length in all parts of the Earth. They falls around the 21st of March and 21st of September.

Equinox (Physical Geography)

Two periods when the declination of the sun is at the equator. The autumnal equinox occurs on September 22 or 23. The vernal equinox occurs on March 21 or 22.

Equinox (Solar Energy)

The two times of the year when the sun crosses the equator and night and day are of equal length; usually occurs on March 21st (spring equinox) and September 23 (fall equinox).

Equinox (Weather)

The point at which the ecliptic intersects the celestial equator. Days and nights are most nearly equal in duration. In the Northern Hemisphere, the vernal equinox falls on or about March 20 and the autumnal equinox on or about September 22.
Related term: Dave's Dictionary

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