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| The study of the moon, stars and other objects in space |
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| A system of organizing time that defines the beginning, length, and divisions of a year. |
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| The spinning of Earth on its axix. Earth's rotation takes 24 hours or 1 day. |
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| The imaginary line that passes through Earth's center and the North and South poles. |
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| The movement of one object around another. Earth revolves around the sun. It takes appoximately 365 1/4 days to complete one revolution. |
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| Neither end of Earth's axis is tilted toward the sun. Both hemispheres receive the same amount of energy. Equal day and night. |
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| When the sun reaches its greatest distance north or south of the equator. The longest and shortest days occurs at opposite hemispheres. Summer solstice is June 21st and winter solstice is December 21st. |
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| The path one object follows around another. Earth's orbit around the sun is not quite circular. Its elongated or ellipse. |
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