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Chapter 3: Gravity and the Rise of Modern Astronomy
Galileo Galilei and the Telescope
This is an excellent site to explore Galileo's life and contributions. Click on "Science" and then check "Observations, Experiments, and Discoveries" to examine his telescopic discoveries.
Visit the The Galileo Project web site
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The Law of Universal Gravitation
In this site you will find a simple description of gravity and three great java applets on applications of Newton's law of gravity (one for Kepler's 2nd law and two for ballistic motion of projectiles). Make sure you read the "Help" files before trying the applets. The site also includes good tutorials on a number of topics on astronomy.
Visit the Gravity web site
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Working with Orbits
This site from the Univ. of Maryland includes a number of tools for drawing orbits in addition to being a great source of solar system calculators, viewers, and orbital integrators.
Visit the Astronomy Workshop web site
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