Why Today Is the 1st Day of Autumn in Earth’s Northern Hemisphere | Live Science

Happy Equinox!

This morning (Sept. 23) at 3:49 a.m. EDT (0749 GMT) marked the official celestial beginning of autumn in the Northern Hemisphere.

Although beaches have long been closed in many parts of the United States and there’s already been a meteorological shift from summer into autumn, today marks a special transition in which the sun crosses the celestial equator, or the projection of Earth’s equator onto the sky, from north to south. While the north gears up for chillier days, the south is welcoming springtime.

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