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23 Cards in this Set
- Front
- Back
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Word
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Definition
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Revolution
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movement of a planet or other body orbiting another body
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Rotation
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spinning of a planet or other body on its axis
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Axis
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imaginary line through the center of a planet or other body around which that body spins
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Solar noon
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time of day when the sun is highest in the sky
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Standard Time
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system whereby all places within a time zone all have the same time
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International Date Line
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boundary formed where the first and 24th time zones meet
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Perihelion
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point in a planet's orbit at which it is closest to the sun
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Aphelion
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point in a planet's at which it is farthest from the sun
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Solstice
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day of the year the sun reaches it's highest or lowest point in the sky
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Equinox
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day the sun shines directly on the equator
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Apogee
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point at which the moon is farthest from earth
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Perigee
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point at which the moon is closest to earth
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Spring tide
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tide that is higher or lower than a normal tide
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Neap tide
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tide that is not as high or as low as a normal tide
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Phases
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changing shapes of the moon
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Crescent
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phase when less than half the moon is visible
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Gibbous
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phase when more than half the moon is visible
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Umbra
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center or dark part of a shadow
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Penumbra
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light part of a shadow
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Lunar eclipse
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passing of the moon through earth's shadow
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Solar eclipse
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passing of the moon between earth and the sun
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Corona
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outer layer of the sun's atmosphere
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