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Astronomy: Unit 2 Vocab

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