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
• Activities
   
• Join us!
   
• Astro-links
   
• Critical
  Thinking
• Officers
   
• About the CAS
   

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

The Society would like to thank Dr. Joshua Burton for his talk:
PLUTO HAD IT COMING: Orbital resonance, the Kuiper Belt, and Planet 9

The next General Meeting of the Chicago Astronomical Society will be on Saturday, December 6, 2025

Scouting America - Astronomy Merit Badge

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

The Chicago Astronomical Society is part of the