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26 Cards in this Set
- Front
- Back
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astronomy
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the study of the moon, stars and other objects in space
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axis
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the imaginary line that passes through Earth's center and the north and south poles
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rotation
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Earth's spinning on its axis
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revolution
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the movement of one object around another object
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orbit
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Earth's path as it revolves around the sun
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latitude
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a measurement of distance from the equator
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24 hours
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the length of time it takes Earth to rotate on its axis
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365 1/4 days
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the length of time it takes Earth to revolve around the sun
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27.3 days
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the length of time it takes the moon to revolve around the Earth and rotate on its axis
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solstice
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two days a year when the sun is overhead at either 23.5 degrees south or north
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equinox
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two days a year when the lengths of nightime and daytime are "equal"
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vernal equinox
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occurs March 21 and marks the beginning of spring
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autumnal equinox
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occurs September 23 and marks the beginning of fall
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phase
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different shapes of the moon you see from Earth
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eclipse
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occurs when an object in space comes between the sun and a third object and casts a shadow on that object
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solar eclipse
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occurs when the moon passes between Earth and the sun
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umbra
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the darkest part of the shadow during an eclipse
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penumbra
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largest part of the shadow during an eclipse
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lunar eclipse
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occurs during full moon when Earth is directly between the moon and the sun
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tides
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the rise and fall of water
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gravity
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the pull of objects toward each other
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satellite
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any natural or artificial object that revolves around an object in space
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geosynchronous
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object's revolve around the earth at the same rate that Earth rotates
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telescope
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an instrument used to make objects seem closer
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craters
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round pits on the moon
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maria
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dark, flat areas on the moon
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