Astronomical fall begins Tuesday: What the autumnal equinox means for skywatchers

Astronomically speaking, fall arrives Sept. 22 at 8:05 p.m. Eastern. This is the date and time of the autumnal equinox, the precise moment when the sun is directly above the Earth’s equator. The Earth’s seasons, fall, winter, spring and summer, are caused by the planet’s orbit around the sun and the 23.5-degree tilt of its...
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