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the gaseous envelope surrounding the earth; the air |
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- the state of the atmosphere with respect to wind, temperature, cloudiness, ect. |
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| the average weather conditions over a period of time |
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a turning around as on an axis. |
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Either of the two times a year when the sun is at its greatest distance from the celestial equator: about June 21, when the sun reaches its northernmost point on the celestial sphere, or about December 22, when it reaches its southernmost point. Compare summer solstice, winter solstice. |
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| the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox or spring equinox) and September 22 (autumnal equinox). |
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| Tropic of Capricorn and Tropic Of Cancer |
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| either of two corresponding parallels of latitude on the terrestrial globe, one (tropic of Cancer) about 23 1 / 2 ° N, and the other (tropic of Capricorn) about 23 1 / 2 ° S of the equator, being the boundaries of the Torrid Zone. |
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