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Earth, Sun, Moon System Vocab
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Spectroscopy
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18 Terms
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Axis
An imaginary line that passes through a planet’s center and its north and south poles, about which the planet rotates.
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Rotation
The spinning motion of a planet on its axis.
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Revolution
The movement of an object around another object.
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Sun
A large, gaseous body at the center of the solar system.
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Moon
A natural satellite that orbits a planet.
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Orbit
the path of an object as it revolves around another object in space.
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Eclipse
The partial or total blocking of one object in space by another.
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Penumbra
The part of a shadow surrounding the darkest part.
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Umbra
The darkest part of a shadow.
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Geocentric
Term describing a model of the universe in which Earth is at the center of the revolving planets and stars.
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Heliocentric
Term describing a model of the solar system in which Earth and the other planets revolve around the sun.
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Equinox
Either of the two days of the year on which neither hemisphere is tilted toward or away from the sun.
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Solstice
Either of the two days of the year on which the sun reaches its greatest distance from the equator.
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Tide
The periodic rise and fall of the level of water in the ocean.
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Spring Tide
This means that high tides are higher and low tides are lower than average.
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Neap Tide
The tide with the least difference between consecutive low and high tides.
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Phase
One of the different shapes of the moon as seen from Earth.
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Law of Universal gravitation
The scientific law that states that every object in the universe attracts every other object.
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