Question

What is solar constant ?

Answer 1

The solar constant is a flux density measuring mean solar electromagnetic radiation per unit area. It is measured on a surface perpendicular to the rays, one astronomical unit from the Sun. The solar constant includes all types of solar radiation, not just the visible light. 




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Answer 2

the rate at which energy reaches the earth's surface from the sun, usually taken to be 1,388 watts per square metre.