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 2/19/2026
5:30 p.m. - 7 p.m. Pacific 		Science Fair @ Buena Vista Elementary, Walnut Creek, CA Buena Vista Elementary
2355 San Juan Ave Walnut Creek, CA
Tue 2/24/2026
7:15 p.m. - 9 p.m. Pacific 		General Meeting Lindsay Wildlife Experience
1931 First Avenue Walnut Creek, CA
Thu 2/26/2026
6:30 p.m. - 8 p.m. Pacific 		Diablo View Middle School Astonomy Night Diablo View Middle School
300 Diablo View Lane Clayton, CA
Tue 3/3/2026
1:50 a.m. - 5:17 a.m. Pacific 		Lunar Eclipse (Early Morning)