The moment at which the sun passes through this point on or about September 23, marking the beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere.
Autumnal-equinox Sentence Examples
The Balance, obviously indicating the equality of day and night, is first mentioned as the sign of the Libra autumnal equinox by Geminus and Varro, and °b and tained, through Sosigenes of Alexandria, official re Scorpio.
All that is certainly known about the antiquity of the sieu is that they were well established in the 3rd century B.C. Their initial point at the autumnal equinox marked by Kio (Spica Virginis) suits a still later date; and there is no valid evidence that the modern series resulted from the rectification of an older superannuated arrangement, analogous to the Krittika sequence of nakshatras.
In The Calendar, For Example, Which Was Attempted To Be Introduced In France In 1 793, The Beginning Of The Year Was Fixed At Midnight Preceding The Day In Which The True Autumnal Equinox Falls.
33 Sec., And That The Year Commences On, Or Immediately After, The New Moon Following The Autumnal Equinox.
The new arrangement was regarded as beginning on the 22nd of September 1792, this day being chosen because on it the republic was proclaimed and because it was in this year the day of the autumnal equinox.