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unit 4
| Term | Definition |
|---|---|
| rotation | the spin of a body on its axis |
| day | the time required for earth to rotate once on its axis |
| revolution | the motion of a body that travels around another in space; one complete trip along an orbit |
| year | the time required for the earth to orbit once around the sun |
| season | a division of year that characterized by recurring weather conditions, and determined by both earth's tilt relative to the sun and earth's position in its orbit around the sun |
| equinox | the moment when the sun appears to cross the celestial equator |
| solstice | the point at which the sun is as far north or as far south of the equator as possible |
| satellite | a natural or artificial body that revolves around a planet |
| gravity | a force of attraction between two objects that is due to their masses |
| lunar phases | the different appearances of the moon from earth throughout the month |
| eclipse | an event in which the shadow of one celestial body falls on another |
| umbra | a shadow that blocks sunlight such as the conical section in the shadow of the earth or the moon |
| penumbra | the outer part of a shadow such as shadow cast by earth or the moon in which sunlight is only partially blocked |
| tide | the periodic rise and fall of water level in the oceans and other large bodies of water |
| tidal range | the difference in levels of ocean water at high and low tide |
| spring tide | a tide of increased range that occurs two times a month, at the new and full moons |
| neap tide | a tide of minimum range that occurs during the first and third quarters of the moon |
Created by:
kendra gilmore
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