Sep 22 2010

What is the autumn equinox or September equinox?

Category: Science


The autumn equinox (September equinox) occurs when the ecliptic and the celestial equator intersect. The point of intersection is known as an equinoctial point. In other words, it is when the sun crosses the equator making day and night the same length (if you are sitting on the equator). Usually this occurrence takes place on or near September 22nd of each year and marks the beginning of the fall season in North America.

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