The Astro Calculator: If you watch your units, this page
makes it easy to do numerical problems in physics, astronomy and
Sky Survey : The Space Telescope Finding Chart Site
NIST: All sorts of scientific databases
Visualization: Animated model of the Solar system with
selected asteroid! Very nice.
Astronomical Bibliographical and Data source.
NASA ASTROPHYSICS DATA
SYSTEM: Bibliographic search and on-line access to articles
(if you are at Gettysburg)
Smithsonian Physical Tables: this classic reference source
comprises 901 tables of general interest to scientists and
engineers, and of particular interest to those involved with
physics in its larger sense." The downloadable tables include
general physics constants, constants for temperature
measurement, the blackbody and its radiant energy, temperature
characteristics by material, latent heat, thermal properties of
gases, acoustics, geomagnetism, and many more.