Solar constant
This is an old revision of this page, as edited by TheAmericanRedoubt (talk | contribs) at 08:54, March 23, 2015. It may differ significantly from current revision.
Solar constant is the average amount of solar radiation that reaches the earth's upper atmosphere on a surface perpendicular to the sun's rays.
It is equal to 1353 Watts per square meter or 492 Btu per square foot.