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This unit introduces students to some general concepts of astronomy. Topics include geocentric versus heliocentric theories of the solar system and how they explain the sun's movements, sidereal days versus solar days,...
Created by David P. Stern, this set of three web pages provides a calculation of paths, times, and distances for a flight to Mars and back. The author uses a Hohmann transfer ellipse between two circular orbits. This is...
This is a set of 7 illustrated web pages discussing Kepler's laws. Included are equations and properties of conic sections, the scale of the solar system, the energy equation for Keplerian motion, Newton's "Universal...
This site discusses three of Kepler's laws of planetary motion: the law of ellipses, the equal areas law and the harmonic law. Each law is discussed in detail and includes an interactive animation that is helpful in...
This java applet models the motion of planets in the solar system, demonstrating Kepler's Second Law. The time taken to sweep out equal areas on opposites sides of the orbit is shown. The semimajor axis and...

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