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Twin City Amateur Astronomers
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Welcome to the TCAA

Welcome to the Twin City Amateur Astronomers' web site.

Located in the twin cities of Bloomington and Normal, Illinois, the TCAA was formed in 1960 to share our love of astronomy.

The purposes for which the TCAA is formed are: to promote in every way among its members and the general public an interest in, and knowledge of, astronomy and its allied sciences; to advance amateur astronomy and observational techniques; to render assistance to other individuals or organizations working in the same or related fields; and to do everything necessary and proper to further such on a formal or informal basis.

On this site you can find out about us, about our public observing sessions, held at our dark sky observatory southwest of Bloomington; our public presentations, which take place at a variety of venues usually in the Bloomington-Normal area; and even peruse our award-winning newsletter, The Observer.


Our next Event...

Venus & Mars Tonight

When Saturday, July 10, 2021 8:30 PM - 10:30 PM
Status Scheduled
Where Sugar Grove Nature Center
What Venus and Mars are alright tonight, but in the coming days Venus will pass Mars as seen in Earth’s evening sky. Venus is an inferior planet whereas Mars is a superior planet. Learn how and why they move as they do. OBSERVING FIRST!
more...

We are a 501c(3) non-profit organization. All contributions are tax deductable.

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