Today's the day---September 22, at 7:05 PM CDT, the September equinox occurs in Chicago, and astronomical fall begins in the Northern Hemisphere.
The sun appears to fall directly over the equator of the Earth. The dark half of the year begins--Shorter days and longer nights in the Northern Hemisphere. Meanwhile there will be longer days in the Southern Hemisphere, as Spring begins in Australia.
At Stonehenge people gather to celebrate the turning of the year, as the sun appears in an east-west alignment between the stones.
Have you heard of Manhatnhenge? The sunrise/sunset aligns with the tall buildings on the east/west streets.
In Chicago too, people celebrate Chicagohenge. For a few days, the sun appears in a perfect alignment between the tall buildings along the east-west grid of the city.
Yes, longer nights are coming. We have seen earlier sunsets already. We have seen the streetlights come on around 6:30 pm now. There is a chill in the air. We think of jackets and hoodies, cozy sweaters and soups. We think of harvest too, and the harvest moon.
The harvest moon is the first full moon after the autumnal equinox. This year, we will see the harvest moon on September 26.
Welcome fall and the harvest moon!