Question

what is solar constant

Answer 1

solar constant means that the rate at which energy reaches the earth's surface from the sun, usually taken to be 1,388 watts per square metre.
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Answer 2

hey here is your answer
The solar constant is defined as the quantity of solar energy (W/m²) at normal incidence outside the atmosphere(extraterrestrial) at the mean sun-earth distance. ... This number turns out to be about 1.366 kilowatts per square meter. The spectral distribution is given in the figure.

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