American Heritage® Dictionary of the English Language, Fourth Edition
- n. The average density of solar radiation measured outside Earth's atmosphere and at Earth's mean distance from the sun, equal to 0.140 watt per square centimeter.
- n. The amount of incoming solar radiation per unit area, measured on the outer surface of Earth's atmosphere, in a plane perpendicular to the rays.
GNU Webster's 1913
- n. (Astron.) the quantity of heat received by the earth from the sun in a unit of time. It is, on the C. G. S. system, 0.0417 small calories per square centimeter per second.
- n. the rate at which radiant solar energy is received at the outer layer of the earth's atmosphere
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