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.

• Observing
• Planned Events
• Join us!
• Astro-links
• Baloney Detector
• Officers
• About the CAS

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

The Society would like to thank Dr. Jim Sweitzer for his lecture Electric Skies at our Nov. 9 meeting.

Our 2025 meeting schedule is planned!
Click on the "Planned Events" menu item above for the complete list.

Also, please note the addition of a "Baloney Detector" link in the menu above.

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.

Scouts, BSA - Astronomy Merit Badge

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

The Chicago Astronomical Society is part of the