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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