Geoff's Really Useful Astronomy Links
SIMBAD on the Web
Astrophysics Data System (ADS) Abstract Service
AAS Home Page
CADC
Space Telescope Electronic Information Service
Astro-ph
APOD
Skyview
AAVSO
NED
LEVEL 5
Space Weather
Sky & Telescope
Astrophysical Calculator
WUPPE
Precession
Julian Dates
Atomic Line List
USNO Data Page
NASA OSS Page