Twin City Amateur Astronomers

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...

October Public Observing - Globular Clusters

When Saturday, October 13, 2018 7:00 PM - 9:00 PM
Status Scheduled
Where Sugar Grove Nature Center
What Globular Clusters These star clusters are among the very oldest star systems within the Milky Way galaxy. Today a swarm of perhaps 150 tightly-packed clusters orbit the core of our home galaxy. In addition to our presentation, we will have a laser-guided sky tour and telescope observing.

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

Clear Sky Chart for Sugar Grove Observatory
Visitor Count