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| Term used when sun is directly overhead (90 degrees angle of inclination) |
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| June 21; time when sun at zenith over Tropic of Cancer |
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| Number of degrees sun is above the horizon; determines temperature |
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| Another name for 0 degrees latitude (divides earth into hemispheres) |
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| 90 degrees N latitude (0 degrees solar inclination at Equinoxes) |
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| March 21; time when sun is at zenith over the equator |
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| Dec. 21; time when sun at zenith over Tropic of Capricorn |
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| Sept. 22; time when sun at zenith over the equator |
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| Movement of earth in orbit around the sun (365 days) |
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| Spinning of earth around its axis; causes day and night |
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| Line through earth from North to South Pole |
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| Time between sunrise and sunset (12 hours at Equinoxes) |
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| Region of earth between 23 degrees and 60 degrees N and S latitudes |
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| Region of earth between 23 degrees N and 23 degrees S (little seasons) |
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| Summation of weather conditions over a period of years |
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| Large land region marked by a particular climatic regime |
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| Condition of atmosphere at a particular time and place |
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| Rotation of earth when closest to sun (Jan. 3) |
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| Position of earth when farthest from sun (July 4) |
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| Electromagnetic rays emitted by sun through atmosphere |
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