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astronomy
Term | Definition |
---|---|
astronomy | the study of the moon, stars and other objects in space. |
axis | an imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates. |
rotation | the spinning motion of a planet on its axis. |
revolution | the movement of an object around another object. |
orbit | the path of an object as it revolves around another object in space. |
solstice | the two days of the year on which the sun reaches its greatest distance north or south of the equator. |
equinox | the two days of the year on which neither hemisphere is tilted toward or away from the sun. |
moon | a natural satellite that revolves around a planet. |
phase | one of the different apparent shapes of the moon as seen from Earth |
gravity | a force that moves rocks and other materials downhill: the force that pulls objects toward each other. |