[a lot of these links are now broken; my apologies, but the internet has become a very dynamic place since this page was first assembled in 1993]
Astrophotography -- by by George Greaney
Teacher Space Education Resources from NASA
SpaceRef.com (for space news and gossip)
The International Dark-Sky Association
Live close-up images of the Sun, from ground-based observatories
Real pictures of the Sun, from NASA
Auroral activity maps, from NOAA
Phase of the Moon , an image of the moon's current phase (or that for any specified date)
Photos of the Moon , Photos and quizzes about the moon. Also many other solar system objects.
Data on Sun/Moon Rising and Setting Times, Positions, Eclipses, etc from USNO
Information about eclipses, from the Exploratorium
Astronomy on the Net, a set of links from the ASP
Planetary Photojournal, from NASA
Mount Wilson Observatory Online Stargazer Map generates locations of stars, planets, and other objects of astronomical interest for a given date and place.
The Constellations by J. Wallin, provides maps of specified constellations
Stars and Galaxies in 3D (VRML), by Paul Houle and Harry Bowman
Solar System Live
allows you to view locations/motions of the planets around the sun
based on given dates
Views of The Solar System
links relevant to solar system objects and topics
Earth Viewer
allows you to look at the (simulated) earth from any point,
even from the sun or the moon
Satellite view of the earth's full disk over a full year,
allows you see the change in the sun's illumination of the earth
due to the earth's tilt, from NRL-Monterey (3.5 MB)
Astronomy Picture of the Day, from NASA
The Web Nebulae, by Bill Arnett
The Nine Planets, by Bill Arnett
NASA Kid's Club
and
NASA Student Resources
Universe Today -- all kinds of astronomy/space links
Frequently Asked Questions About Being an Astronomer, from NOAO
Star Child - A learning center site for young astronomers,
educational information directed towards children in grades K-8
Imagine - A learning center site for young astronomers,
educational information directed towards children in grades 9-14
History of Astronomy, an excellent source of historical information
Multi-wavelength image gallery from IPAC
Astronomy Lecture Notes
from an introductory undergraduate astronomy class, by Nick Strobel
Astronomy 100-level lectures,
from Terry Herter
Simulations of Astronomical Phenomena, also from Terry Herter,
has fantastic graphics of binary star orbits and of stellar evolution
The Hydrogen Main Sequence Calculator,
by Martin Weinberg
Cosmology Tutorial by Ned Wright
Animated and informational tutorials on the topics of
The state of the art on
Searches for Extrasolar Planets
and the well-maintained
Extrasolar Planet Encyclopedia
also
here
Fun with
Blackbody Radiation in VRML,
and
the Inner Solar System in Java,
both by Karen Strom
American Association of Variable Star Observers
Variable Star Net
AstroWeb , an extensive database of research-oriented links from the CDS
And for the Slightly More Technical-Oriented.....