Astronomical Calendar and Astronomical Companion from Guy Ottewell's Universal Workshop
Planispheres and other observing aids from David Chandler.
Meteorites from Mare Meteoritics
Celestial spheres from Spherical Concepts, Inc.
Alan Fisher’s Web page on Kepler’s Laws and Newton’s without Calculus
Spectacular astrophotography by Tony and Daphne Hallas,
Astronomical League
Universe Today for space exploration and astronomy news updated every weekday.
Astronomical Society of the Pacific
Royal Astronomical Society of Canada
International Dark-Sky Association
Planetarium Servicing from Ash Enterprises
Planetarium Electronics from SkySkan
Interesting and useful physics supplements come from Insight Press, 614 Vermont
Street, San Francisco, CA 94107. +1 415-826-3488
Cathie Havens, S&S Optika, 5174 S. Broadway, Englewood, CO 80110.
303-789-1089.
