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sunshine duration
duration within a given time interval during which the irradiance from direct solar radiation on a plane normal to the sun direction is equal to or greater than 120 W·m−2
Note 1 to entry: This entry was numbered 845-09-93 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-1282 in CIE S 017:2011.