Day and night get equal billing on Tuesday. A guide to the fall equinox

Tuesday marks the fall equinox, when day and night are approximately equal in length. This event signals the start of autumn in the Northern Hemisphere and spring in the Southern Hemisphere. During the equinox, the sun passes directly over the equator at noon.
The fall equinox is Tuesday, when light and darkness split the day evenly. It marks the beginning of fall for the Northern Hemisphere and the beginning of spring in the Southern Hemisphere. On the equator, the sun will be directly overhead at noon. Equinoxes are the only times when both the north and south poles...
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