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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
retrograde
point in a planet's orbit when it is farthest from the sun
aphelion
copernicus's model of the solar system in which the planets orbit the sun.
heliocentric
oval shape centered on two points instead on of one point.
ellipse
point in a planet's orbit when it is closest to the sun
perihelion
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
eccentricity
unit of measure that is the average distance between the sun and the earth
astronomical unit