The arrival of fall coincides with an unusual twice-yearly milestone in Chicago, the so-called “Chicagohenge” phenomenon where the sunset and sunrise line up with the city’s grid.
The Adler Planetarium said Chicagohenge arrives twice a year, at the start of spring and the beginning of autumn.
The planetarium said the fall Chicagohenge began Friday, and Monday offers the final glimpses of the phenomenon until next spring.
East-facing onlookers saw the sun framed by Chicago’s buildings in the morning, and a similar sight could be seen from the west at sundown — but some viewers this year reported cloudy weather spoiling the views.
Monday night’s sunset — about 6:47 p.m. local time — will close out this year’s Chicagohenge.
“Finding a place to spot Chicagohenge is a no-brainer! Simply find one of Chicago’s east-west facing streets, pick a spot 5-10 minutes before sunrise or sunset, and enjoy the view,” the planetarium said.
