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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.
'''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.
It is equal to 1353 Watts per square meter or 492 Btu per square foot.
[[category:energy]]
[[Category:Energy]]