Mount Diablo Astronomical Society

About Us

Welcome to Mount Diablo Astronomical Society!
M.D.A.S. was formed in 1957 as part of the National "Moonwatch" program established to time the first man-made satellites so accurate orbits could be calculated.
We invite you to attend our monthly meetings. Experience outstanding speakers and conversation with friendly astronomy enthusiasts.

Join us: become an MDAS member!

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Club Contact Info

Mount Diablo Astronomical Society
2070 N. Broadway #4889
P.O. Box 4889
Walnut Creek CA 94696
Contact This Club

UPCOMING EVENTS

Thu 4/16/2026
7:30 p.m. - 9 p.m. Pacific 		Fallon MS Astronomy Night Fallon Middle School Blacktop
3601 Kohnen Way Dublin, CA
Sat 4/18/2026
7 p.m. - 11 p.m. Pacific 		Public Astronomy Program: Constellations - Stories in the Sky Mount Diablo - Lower Summit Parking Lot
Summit Rd Clayton, CA
Tue 4/21/2026
4:30 p.m. - 6 p.m. Pacific 		Rheem Science Fair Donald L. Rheem Elementary School
90 Laird Dr Moraga, CA 94556 Moraga, CA
Wed 4/22/2026
6:30 p.m. - 8:30 p.m. Pacific 		State Park VIPP Training #1