What is the date and time of the autumn equinox?

Question

What is the date and time of the autumn equinox?

Answer 1

http://ns1763.ca/equinox/vern1788-2211.h...

Answer 2

The date and time vary from year to year, depending on the earth's orbit around the sun and where the observer happens to be located.  The equinoxes generally occur between March 20-22 (spring) and September 20-22 (fall).  You can get the exact time and date for your location by consulting an almanac or a weather website.

Answer 3

21st of September. Equinox refers to the occasion when day and night are the same length all over the world, so an exact time when a day and a night are equal is not possible.

Answer 4

For 2008 it occurs on September 22nd at 1544 UTC. For other years, see: http://www.timeanddate.com/calendar/seas...

The autumn equinox is defined as the time at which the sun reaches a celestial longitude of 180 degrees (measured from the vernal equinox) and is therefore overhead at the equator.