The Calendar Sky - Customize your own
astronomical and space calendar with predictions
for your geographical location, with astronomical events (eclipses, planetary conjunctions,
etc.), International Space Station passage, and much more.
Astronomy textbook from open source
Wikibooks - free books which can edited (added to or corrected) by other visitors to the
Spaceweather PHONE monthly service
that will call you when any new space science or astronomy events (such as appearance of a
new bright comet) occur.
AAVSO - American Association of Variable Star Observers -
Information for observing and measuring the brightness curves of variable
Association of Lunar and Planetary Observers - Association of Lunar and Planetary Observers
is one of the oldest amateur astronomy organizations; learn all about viewing and doing
serious scientific research on solar system objects (planets, the Sun, asteroids, comets, etc.)
Astronomical League - Confederation of U.S. astronomical societies inviting
you to browse
their information on astronomy and astronomical societies.
American Meteor Society - The
American Meteor Society is a collaborative effort between amateur and
professional astronomers, for the purpose of conducting visual observations
of both meteor showers and meteors appearing at random (sporadic meteors).
Dark Sky Association
non-profit member organization that teaches others how to preserve the night sky through
factsheets, law references, pictures, and web resources.