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Astronomy: Unit 2 Vocab

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Across
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Kepler's law that relates a planet’s orbital period to its average distance from the Sun.
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Believed the universe consisted of several perfect, crystal spheres with Earth at the center.
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Compiled 30 years-worth of careful observations and measurements of the stars and planets.
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Apparent change in direction of a planet, caused by Earth lapping it in orbit
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Earth-centered view of universe
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Point when a planet is farthest from the Sun in orbit
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Made several observations with a telescope that helped wear down the idea of the Earth-centered universe.
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Realized that the laws of physics used on Earth could be applied to all objects out in the universe.
Down
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Refined the geocentric model and added epicycles, and this version was used for nearly 1400 years.
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Began a revolution by suggesting the Sun was at the center of the universe.
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Sun-centered view of universe
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Apparent movement of nearby object caused by the motion of the observer
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Kepler's law that says planets sweep out equal areas in equal amounts of time while in orbit
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Developed three laws to describe the motion of the planets.
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Kepler's law that says orbits are elliptical in shape
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Point when a planet is nearest the Sun in orbit
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