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“equinox”
equinox
Either of the two annual crossings of the equator by the sun, once in each direction, when the length of day and night are approximately equal everywhere on earth.
The equinoxes occur around March 21 and September 23.
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“equinox”
The point at which the sun's path crosses the celestial equator moving from south to north: The vernal equinox marks the zero point in both the equatorial and ecliptic coordinate systems; horizontal angular distances are measured eastward from this point.
The vernal equinox occurs on March 20 or 21 and the autumnal equinox on September 22 or 23, marking the beginning of spring and autumn, respectively, in the Northern Hemisphere (and the reverse in the Southern Hemisphere).
The term "equinox" comes from Latin meaning "equal night" because the days on which an equinox falls have about equal periods of sunlight and darkness.
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vern-, vernal-
(page 1)
Word Entries at Get Words:
“equinox”
equinox
1. The two times of the year when the sun crosses the equator and night and day are of equal length; and it usually occurs on March 21st (spring equinox) and September 23 (fall equinox).
2. One of two points at which the ecliptic cuts the celestial equator.
2. One of two points at which the ecliptic cuts the celestial equator.
The vernal equinox is the point in which the sun, traveling on the ecliptic, crosses the celestial equator from south to north.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 10)
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“equinox”
autumnal equinox
The intersection of the ecliptic and the celestial equator that the sun passes each year on its way to southern (negative) declinations which occurs on September 23.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 4)
vernal equinox
The equinox, or celestial equator, which occurs about March 21.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 27)