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Autumnal equinox occurs in 2020 on September 22

We are coming up on the autumnal equinox, which occurs this year on September 22 at 9:31 am EDT. You can learn more about what an equinox is by reading this story from EarthSky, a great source of astronomy-related (and sometimes atmosphere-related) news. This marks the beginning of astronomical fall (climatological fall began on September 1).