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The Earth's Motions

AB
AphelionThe furthest point the Earth reaches while orbiting the sun
PerihelionThe closest point the Earth reaches while orbiting the sun
EllipseA slightly irregular circle
EccentricityA measure of the severity of an ellipse
FociThe points found in the center of an ellipse
Major AxisThe longest line that is drawn through the foci of an ellipse
RevolutionThe movement of the Earth around the sun
RotationThe movement of the Earth around its axis
HeliocentricA model of the solar system with the sun in the center
GeocentricA model of the solar system with the Earth in the center


Mr. Saffer

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