Chicago
Astronomical
Society

...to promote the interest in, and advance the knowledge and understanding of
astronomy, the most ancient and the noblest of the physical sciences.

Absolutely nothing happened in Sector 83 by 9 by 12 today.

Dark Sky Alert!

Please darken our skies by turning off any unneeded outdoor lighting between the hours of 11 PM and 6 AM. A great many migratory birds will pass over Chicago between now and Novermber 30.
Let's please not confuse them needlessly.

The Chicago Astronomical Society is a proud member of the
Astronomical League

The Chicago Astronomical Society
is part of the