That’s the day the sun lines up with our east-west streets so you can get stunning pictures of the sunset lined with skyscrapers.

 

https://www.npr.org/2019/09/24/763662788/the-solar-spectacle-that-is-chicagohenge?utm_campaign=npr&utm_medium=social&utm_term=nprnews&utm_source=facebook.com&fbclid=IwAR3eTUgpH9Wq6ZHcgmZISJCm2c5ncib2sfW3vSz6cIlIKo_ZxzL88Ao9-B0