Find a Galaxy. How the Earth Was Made: Asteroids. The Universe: Sailing on the Sun. The Universe: The Constellations. The Phases of the Moon. Arctic Midnight Sun. Aurora Borealis. Carl Sagan - Cosmos - Democritus. Carl Sagan - Cosmos - Eratosthenes. Carl Sagan on Epicycles, Ptolemy, and Kepler. Carl Sagan on Astrology. Mechanisim of Solar & Lunar Eclipse. Carl Sagan on Tycho Brahe, Johannes Kepler, and ellipses. Module1 - Sidereal days vs Solar days.
Galileo and His Telescope Part 2 of 5. December 21 2012 THE END. Mechanisim of Solar Eclipse. Explain-it: How do the tides work? M13 Globular Cluster. Retrograde Motion and the Opposition of Mars. Total Solar Eclipse 2006.