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EQUINOX. The name given to two periods of the year when the days and nights are equal; that is, when the space of time between the rising and setting of the sun is one half of a natural day. Dig. 43, 13, 1, 8. Vide Day.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
SEPTEMBER 23 - AUTUMNAL EQUINOX THE Autumnal Equinox is when the Earth's equator is almost directly in line with the centre of the Sun.
Al Jarwan explained that at the beginning of the autumnal equinox, the number of hours at night is equal to daylight hours.
September 3: Labor Day 11: Patriot Day 22: Autumnal Equinox 24: Full Harvest Moon
While the country has been experiencing longer nights since the autumnal equinox last month, it will still take some time before markedly colder nights can be felt throughout the archipelago.
Mikelis Day is a harvest festival, the autumnal equinox when the sun turns towards winter and when day and night are of equal length --the start of the astronomical autumn.
During the eclipse the Harvest Moon - the full moon closest to the autumnal equinox - was darkened by the Earth's shadow.
On a lighter note, the occurrence is also known as the Harvest Moon because it falls closest to the autumnal equinox.
Precession also causes winter to lose time to Autumn, which will begin with the Autumnal Equinox on September 23.
The third is due on March 21, the Vernal Equinox, and the next after that on September 23, the Autumnal Equinox.
It's a Harvest Moon, which is the full moon closest to the autumnal equinox, and depending on the year, the Harvest Moon can come anywhere from two weeks before to two weeks after the autumnal equinox.
As shown in Figure 5, the maximum tracking error of middle column (column 6) with a 10 cm eccentric deviation at the typical dates of vernal equinox, summer solstice, autumnal equinox, and winter solstice happens at 8:00 and 18:00 with about 0.23[degrees].