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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.
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This weekend will be followed by three public holidays -- Respect for Senior Citizens Day on Monday, observed each year on the third Monday of September, Autumnal Equinox Day on Wednesday, astronomically determined but usually observed Sept.
Since it is only possible to view the auroras simultaneously in both poles during the Vernal and Autumnal equinox days, NHK has opted to push off the broadcast to September.