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

Tue 6/16/2026
11 a.m. - 1 p.m. Pacific 		Pleasant Hill Library Exploration Stations Pleasant Hill Library
2 Monticello Ave Pleasant Hill, CA
Sat 6/20/2026
8 p.m. - 11 p.m. Pacific 		Public Astronomy Program: The Moon - Earth's Lost Rock! Mount Diablo - Lower Summit Parking Lot
Summit Rd Clayton, CA
Tue 6/23/2026
7:15 p.m. - 9 p.m. Pacific 		General Meeting Lindsay Wildlife Experience
1931 First Avenue Walnut Creek, CA
Sat 7/11/2026
10:30 a.m. - noon Pacific 		Oakley Library's Summer Reading Party Oakley Library
1050 Neroly Road Oakley, CA