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.

Contact Information

P.O. Box 4889
Walnut Creek 94596-3754

Phone: (925) 695-3134

Make a ripple effect by giving to Bay Nature today. Marbled murrelet floating in ocean.