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Tuesday, September 15, 2009

Solar Constant

     The solar constant is the amount of incoming solar electromagnetic radiation per unit area that would be incident upon the top of the Earth's atmosphere at a distance of one astronomical unit, or AU(1.496 × 108 km or 9.3 × 107 mi, roughly the mean distance from the Sun to the Earth). The value of solar constant is about 1.96 cal · cm−2 · min−1 (1367 W-1 m−2).

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