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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.

References in periodicals archive ?
The Philippines has been experiencing longer nights since the autumnal equinox last Sept.
25, Autumnal Equinox Festival, Ethnographic Open Air Museum, Riga
We've had the Autumnal equinox and we're heading towards winter.
It explained that autumnal equinox occurs when the sun's declination is zero degree and there are 12 hours of day and 12 hours of night at all points on the earth's surface, hence day and night will have equal length on Earth.
For people in Huddersfield and the rest of the UK, the 2014 autumnal equinox comes on September 23, so the full moon of this week counts as the Northern Hemisphere's Harvest Moon.
THIS week saw the passing of the Harvest Moon, which is the full moon nearest to the autumnal equinox.
The play celebrates Michaelmas, which takes place near the autumnal equinox.
The first day of fall, or autumn, usually around September 22, is called the autumnal equinox.
In other words, the "northern" histograms of a vernal equinox display higher similarity to the "southern" histograms of the next autumnal equinox despite the movement of the body on the sky sphere are reciprocal at these two cases.
Seasons Natural[R] Cool Weather Blend[TM] will begin shipping to independent pet stores arriving in time for the Autumnal Equinox on September 23 -- the start of the cool season.
Start an autumnal equinox ritual: check your medicine cabinet by September 22 each year.
Japanese financial markets were closed Thursday for the Autumnal Equinox day holiday.