c/o Chabot Space & Science Center
10000 Skyline Boulevard
Oakland, CA 94619
phone: 510-336-7300
web: http://www.aanc-astronomy.org/

phone: 408-356-1125
email: webmaster@observers.org
web: http://www.observers.org
star parties in a variety of locations, informational mailing list

10000 Skyline Blvd, Oakland, CA 94619
phone: 510-336-7300
fax: 510-336-7491
web: http://www.chabotspace.org
youth and teacher programs, volunteer opportunities, planetarium and telescope viewing

12345 S. El Monte Road, Los Altos Hills, CA, 94022
phone: 650-949-7334
web: http://www.foothill.edu/ast/index.htm
night and solar observing, classes, lecture series

P.O. Box 1376
San Juan Bautista, CA 95045
phone: 831-623-2465
email: info@fpoa.net
web: http://www.fpoa.net/

California Academy of Sciences
55 Music Concourse Drive
Golden Gate Park
San Francisco, CA 94118
phone: 415-379-8000
web: http://www.calacademy.org/planetarium
Largest all-digital planetarium in the world: variety of planetarium shows, lecture series featuring prominent astronomers

P.O. Box 15097
San Francisco, CA 94115
hotline: 415-455-5370
web: http://www.sfaa-astronomy.org/
star parties in various locations

P.O. Box 28243
San Jose, CA 95159-8243
hotline: 408-559-1221
web: http://www.sjaa.net/
star parties, observing sessions, classes

P.O. Box 3439
Santa Cruz, CA 95063
phone: 831-335-2423
web: http://astro.santa-cruz.ca.us/
viewing nights, astronomy talks

1801 E. Cotati Ave
Rohnert Park, CA 94928
phone: 707-664-2267
web: http://phys-astro.sonoma.edu/observatory/
monthly public viewing nights
weekly public lecture series, “What Physicists Do,” which includes some astronomy lectures: http://phys-astro.sonoma.edu/wpd.