What's New?

Featured Tool:
Watch (and zoom in on) the animated orbits of planets, asteroids, satellites and extrasolar planets with the Solar Systems Visualizer!



Saturn Ratings

  • Astronomy Classroom

  • Explore the Possibilities

  • Solar System Calculators

  • Solar System Viewers

  • Working With Orbits

  • Orbital Integrators

  • Extragalactic

  • Index of all Tools

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    Friday's
    Astro Fact:
    Did you know that if the Earth were the size of a basketball the Sun would be over one hundred feet in diameter? More...
    visits to the Astronomy Workshop since January 1st, 2000. 

    Materials for Students and Instructors.

    Created by Dr. Douglas P. Hamilton and students at U. Maryland. We gratefully acknowledge support from NSF (1998-2003) and NASA (2003-2010). About Us