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

Mon 3/9/2026
7 p.m. - 8 p.m. Pacific 		MDAS Board Meeting
Thu 3/19/2026
5 p.m. - 7 p.m. Pacific 		Springhill Elementary Science Fair and Sun Party Springhill Elementary School
3301 Springhill Rd Lafayette, CA
Sat 3/21/2026
6:30 p.m. - 11 p.m. Pacific 		Public Astronomy Program: Planets of Our Solar System Mount Diablo - Lower Summit Parking Lot
Summit Rd Clayton, CA
Tue 3/24/2026
7:15 p.m. - 9 p.m. Pacific 		General Meeting Lindsay Wildlife Experience
1931 First Avenue Walnut Creek, CA