Why the Autumnal Equinox Doesn't Fall on the Same Day Every Year

Tuesday, September 25, 2018 - 04:46 in Earth & Climate

Autumn is right around the corner for everyone in the Northern Hemisphere, while those in the Southern Hemisphere are gearing up for warmer spring weather. But the 2018 autumnal equinox of Sept. 22 is later than usual. Why?

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