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the earth -Moon-sun
| Question | Answer |
|---|---|
| rotation | the spin of the 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 body in space; one complete trip along an orbit. |
| year | The time required for the earth to orbit once around the sun. |
| season | a divison of the year that is characterized by recurring weather conditions , and determind 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 clesestial equator . |
| solostice | The point at which the sun is as far north or as far south eqauotor as possible. |
| safellite | a natural or artificial body that revolves around a planet. |
| gravity | A force of attraction between objects that is due to their masses. |
| lunar phases | The different appearances of the moon from Earth throughout the month . |
| ecilpse | 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 the shadow cast by Earth or the moon in which sunlight is only partilally blocked. |
| tide | the periodic rise and fall of the water level in the oceans and other large bodies of water . |
| tidal range | The difference in levels of ocean water at high tide and low tide. |
| spring tide | A tide of increased range that occurs two times a month ,at that new and full moons . |
| neap tide | A tide of minimum range that occurs during the first and third quarters of the moon. |