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- the study of celestial bodies (bodies found in space)
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- spinning of an object around its axis or center
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- time required for one full rotation
- Earth's period of rotation is 24 hours
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- an imaginary line running through the center of an object
- Earth's axis runs between the North and South Poles
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- the edge dividing daylight and darkness
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- the movement of one object around another
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- time required for one full revolution
- Earth's period of revolution is 365.25 days
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- the movement or path of one celestial body around another
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- elongated (flattened) circle
- Earth and other planets have slightly elliptical orbits
- comets have highly elliptical orbits
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