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Rotation: The spinning of the Earth on its axis.Revolution: The movement of the Earth around the Sun.Axis: An imaginary line around which the Earth spins.Orbit: The fixed path the Earth takes around the Sun.Northern Hemisphere: The top half of the Earth.Southern Hemisphere: The bottom half of the Earth.Equator: An imaginary line dividing the Earth into two equal halves.Leap Year: A year with 366 days, occurring every four years.Hemisphere: Half of a sphere or globe, as in the northern and southern hemispheres of the Earth.Tilt: The angle at which the Earth's axis is inclined relative to its orbital plane.Day: The period of light when a given location is facing the Sun.Night: The period of darkness when a given location is facing away from the Sun.
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