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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 ?
In the Philippines, days following the vernal equinox mark longer daytime and shorter nighttime.
In 325, the Council of Nicaea established that Easter would be held on the first Sunday after the first full moon occurring on or after the vernal equinox. This was to promote a clear distinction from the linkage of Easter with the Jewish Passover festival.
They might well find the tribe observing winter solstice or vernal equinox with prayer, music and dance, feasts and gifts.
The vernal equinox is just a few weeks away (as I write this).
"This bright day not only represents the vernal equinox and awakening of nature but also is filled with the spirit of universal humanist ideas," said the greeting.
The onset of Spring, according to the calendars of the UK, US and many other countries in the Northern Hemisphere, is called the Earth's vernal equinox and occurs when the Earth's axis, which is tilted by 23.5 degrees relative to its orbit, neither points towards the Sun, as it does during the Northern Hemisphere's Summer Solstice, nor away from it as it did on the Winter Solstice on December 21 last year, but rather is halfway between the two points.
The monoliths at Stonehenge mark the position of the rising sun on the vernal equinox. Early Egyptians built the Great Sphinx so that it pointed directly toward the rising sun on that day.
King seems to think there is no size limit to what he can create, the work currently coming together is "Vernox,'' a personification of the vernal equinox, which will be larger than "Kosmos.''
QUESTION 5 - for 5 points: In which season does the vernal equinox occur?
TEHRAN (FNA)- Iranians began their New Year festivities as spring arrived for 13 days following the ancient custom of celebrating the vernal equinox.
The spring equinox - or vernal equinox - is when day and night are of equal length, with 12 hours of daylight and 12 hours of darkness.
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].