The Chicago Astronomical Society is the oldest astronomical society in the western hemisphere, started in 1862. To this day, CAS continues to further its mission by maintaining an observatory, offering numerous venues for public outreach, conducting public observing sessions, and hosting monthly meetings and lectures. CAS also puts on two annual festivals each year: the Earth, Wind & Sky Festival and Astrofest. Click on the links to the left for more information about each of these.

History

The Chicago Astronomical Society (CAS) was founded by scholars, and leaders in the arenas of business and politics in 1862 to advance the scientific knowledge of astronomy.  The founders knew that a primary step in their mission was to build an observatory from which to conduct original research in the field. Inquires were made and the prime telescope maker in the United States was identified. A lens was bought and an observatory established. more...

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