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12 Cards in this Set
- Front
- Back
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Astronomy
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study of the universe
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Precession
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the slow, conical motion of the earth's axis of rotation, caused by the gravitational attraction of the sun and moon, and, to a smaller extent, of the planets, on the equatorial bulge of the earth
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Nutation
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wobbling of the Earth's axis that is superimposed on Earth's precession.
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Barycenter
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the common center of mass around which two or more bodies revolve
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Rotation
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the movement or path of a heavenly body turning on its AXIS.
Ex. Earth Rotation - takes about 24 hours, causes day and night to occur |
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Revolution
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the orbiting of one heavenly body around another heavenly body. Ex. earth going around the sun
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Galaxy
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a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. Ex. Milky Way
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Planet
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a heavenly body
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Universe
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all matter and energy that exists in space
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apogee
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the point in its orbit when a planet or satellite is farthest away from the earth
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perigee
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the point in its orbit when a planet or satellite is nearest to the earth
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season
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short period of climate change in an area caused by the tilt of Earth's axis as Earth revolves around the sun
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