- Astronomical Society of the Pacific
International nonprofit organization offering educational programs and products, research publications, and membership benefits.
www.astrosociety.org
- The Unofficial San Francisco Sidewalk Astronomers
Devoted to the encouragement of public astronomy with tips, information, and links geared to the astro-interested beginner.
members.aol.com/raycash/sidewalk.htm
- San Francisco Sidewalk Astronomers
Presenting "urban guerilla astronomy" in which the astronomers stop people on the sidewalk and show them the wonders of the universe all around, including telescope clinics and more.
sfsidewalkastronomers.org
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