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12 hours
Approximately 12 hours of Sun-over-the-horizon. (Same as the vernal equinox)
At any of the equinoxes, both the day and the night have about 12 hours each, almost anywhere on Earth.
Both.
The autumnal equinox is also known as the fall equinox and the September equinox. An example of a sentence using "autumnal equinox" is "This year's autumnal equinox falls on a full moon. "
Autumnal Equinox was 23. September in 1978
In 2011, the Autumnal Equinox begins on September 23rd.
The length of day and night is equal at the Vernal and Autumnal equinox.
The length of day and night is equal at the Vernal and Autumnal equinox.
September 22
The "autumnal equinox" is a single point in time, not a period. In 2015, the autumnal equinox will happen at 08:20 (UT) on the 23rd September.
In the Northern hemisphere, daylight hours decrease after the autumnal equinox.