[10.5.2.5]
NOTE: This term was added in RP-16-17 Addendum 2.
Extraterrestrial beam solar irradiance on a plane perpendicular to a line through the centers of the sun and earth at the mean distance of the earth from the sun. Units: W/m2. The currently accepted default value is 1,366 W/m2. Also called solar constant.
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