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Unformatted text preview: Configurations The inferior planets are and . The superior planets are , , . Elongation is the angle between and . The greatest elongation of Mercury is about 28°. The greatest elongation of Venus is about ° . During superior conjunction the planet is the sun. Quadrature is the name given to a elongation of ° . Opposition is when a planet is . Sidereal period refers to the time it takes a planet to . Synodic period refers to the time it takes a planet and sun to come back to the same earth-planet-sun configuration. Heliocentric Problems The planetary orbits are not exactly . The orbital speeds of the planets are not . The moon orbited the earth and not the sun like all the other planets. Seemed “out of place”. And the heliocentric model was incompatible with Aristotelian physics. For example, it seemed improbable to many that the surface of the earth could spin so fast (over 1000 mph at the equator) and yet have people remain on it....
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- Fall '10
- Astronomy, Planet