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7 Cards in this Set
- Front
- Back
motions of a planet moving in the opposite direction of the normal direction of planetary motion as observed from earth
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retrograde
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point in a planet's orbit when it is farthest from the sun
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aphelion
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copernicus's model of the solar system in which the planets orbit the sun.
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heliocentric
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oval shape centered on two points instead on of one point.
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ellipse
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point in a planet's orbit when it is closest to the sun
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perihelion
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defines a planet's elliptical orbit as the ratio as the ratio of the distance between the foci and the lenght of the major axis
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eccentricity
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unit of measure that is the average distance between the sun and the earth
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astronomical unit
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