The Great American Eclipse
The AAAP Observatory will not be open on Monday, April 8th 2024,
but NASA is hosting a live-stream of the Total Solar Eclipse.
Click the image above for the YouTube stream, starting April 8th!

Guest Speaker

Dr. Tea Temim
The May 2024 AAAP meeting will be on the 14th at 7:30PM in Peyton Hall auditorium (Room 145), Princeton University, via Zoom and broadcast on YouTube.

Dr. Tea Temim, Research Astronomer, Princeton University Department of Astrophysics, will describe her research using JWST imagery to study supernova remnants.

Observatory News

The AAAP Observatory, Washington Crossing State Park (NJ side) will open to the public at sunset every Friday evening from April through October IF the sky is clear.

For complete details about visiting the AAAP Observatory, please click on the "more" button just below.

Weather & Moon

Outreach & Education

One of the purposes of the AAAP is to educate the public about the wonders of the universe over our heads through our lecture series and outreach program.

Our astronomers setup telescopes for public use at Communiversity in Princeton, Super Science Saturday at the NJ State Museum in Trenton and at various public events around Mercer County.

We will bring telescopes to your school or educational event to show and explain objects in the night sky like the Moon, constellations, planets, nebulae and galaxies.

Sidereal Times

Sidereal Times is the official newsletter of AAAP since 1962.

Published in blog form now, it is the best source of current news about club activities. In addition, we publish essays, gear evaluations, astrophotographs, book and movie reviews, poetry, travelogues and technical articles related to our hobby.

AAAP plans to post on this website soon our archive of all issues going back to the club's founding. We hope to complete this project soon.

Connect With Us

AAAP is eager to answer your questions about our facilities, activities and astronomy in general. Please mail us at

Please call at 609-737-2575 for observatory status on Friday nights between 8:00 and 11:00 pm. If no one answers, it is definitely closed. Openings are tweeted on Fridays, as soon as we know that the weather will cooperate.