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solar constant
irradiance produced by the extraterrestrial solar radiation on a surface perpendicular to the Sun's rays at mean Sun-Earth distance
Note 1 to entry: The solar constant is expressed in watt per square metre (W⋅m−2).
Note 2 to entry: This entry was numbered 845-09-78 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-1198 in CIE S 017:2011.