We promote awareness and interest in astronomy and related sciences through educational, inspirational speakers and engaging programs.
An astronomical society rooted in history.
Founded in 1888, the Rittenhouse Astronomical Society is one of the oldest astronomical societies in the United States. Named for famous American astronomer, David Rittenhouse, RAS has held regular events in the greater Philadelphia region for 133 years.
Observe the sky above.
For our monthly events, we partner with wonderful local organizations, including the Franklin Institute in Philadelphia, Ryan Observatory at Muddy Run in Holtwood, and the Betty Huf Planetarium in Warminster. We encourage all those interested in the night sky to join us for our events. We foster creative methods for observing, whether you live in an area with a truly dark sky or in a bright city with a lot of light pollution. Yes, even in downtown Philadelphia or New York City, you can see wonderful astronomical sights with your eyes, a pair of binoculars, or a telescope.
Learn from professionals and experts.
For our monthly events, we invite engaging, informative, creative professionals to speak to our members, as well as the public. Although we are currently still hosting our events on Zoom because of Covid-19, under normal circumstances, we invite attendees to sit under the wonders of a planetarium to listen to our speakers.
Interested in music with space themes? Curious how someone goes from the classroom to working with the International Space Station? Would you like to know what it’s like to build a state-of-the-art telescope in the mountains of Chile? Attend an RAS event!
Join our community!
At the end of the day, we’re a group of people who love astronomy. Under normal circumstances, we have multiple gatherings each month, sharing our experiences, and forming friendships. Although this has been stalled somewhat due to Covid-19, we still have a wonderful community who long to get together in person as soon as it’s safe to do so. Join us!
"The direct tendency of Astronomy is to dilate the heart with universal benevolence, and to enlarge its views."
David Rittenhouse