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Ch 20

Vocab

TermDefinition
Orbit The path an object follows as it moves around other objects.
Revolution The motion of an object around another object.
Rotation A spinning motion.
Rotation axis The line on which an objects rotates.
Solstice A day when Earth's rotation axis is most toward or away from the Sun.
Equinox A day when Earth's rotation axis is neither toward or away from the Sun, and is leaning along its own orbit.
Maria Large, dark, flat areas on the moon.
Phase The portion of the moon or a planet as seen from Earth.
Waxing phase More of the moon's near side is lit.
Waning phase Less of the moon's near side is lit.
Umbra Central, darker area of a shadow where light is completely blocked.
Penumbra Lighter part of a shadow where light is partially blocked.
Solar eclipse When the moon's shadow appears on the Earth's surface.
Lunar eclipse When the moon moves into the Earth's shadow.
Tide The daily rise and fall of the sea level.
Created by: deleted user
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