Weather
Fog animation, last several hours
The Sun
The Sun now (Solar Dynamics Observatory)
Solar eclipses around the world in next 10 years
The nearest stars and how they compare to our Sun [Broken Link]
The Moon
maria and craters on the full moon
Next lunar eclipse visible from San Francisco
Eclipses explained [Broken Link]
The Planets
Sky&Tel This Week's Sky at a Glance
Planet distances from Earth tonight
Jupiter's moons tonight [Broken Link]
Saturn's moons tonight [Broken Link]
Binary and Multiple Stars
Sky&Tel's pretty double stars for everyone
Coldfield Observatory's 200 most beautiful double stars [Broken Link]
The Astronomical League's Double Star Club
Astronomy Magazine: double (and variable) stars by season
more double and multiple stars from Sky&Tel
multiple-star catalogs and statistics by Bruce MacEvoy
Variable Stars and Supernovae
Eclipse timing tool for Algol and more
American Association of Variable Star Observers [Broken Link]
Cataclysmic Variables from the Center for Backyard Astrophysics [Broken Link?]
Recent supernovae, sorted by date
Supernovae, sorted by magnitude at discovery
Galaxies, Nebulae and Star Clusters