Orbits

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9 Terms

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aphelion

long diameter of ellipse

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perihelion

short diameter of an ellipse

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eccentricity

how close to circular an orbit is

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0

shape closest to circle

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1

shape closest to parabola - not circular

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Kepler’s first law

shape orbit is ellipse with sun as one foci

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Kepler’s second law

planets sweep equal areas in equal amounts of time

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Kepler’s third law

T2 = A3

The time it takes to go around the sun (squared) = the distance it is from the sun (cubed)

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foci

center points of an ellipse, sun is one of them