what amount of total solar energy falling on the earth per year?
At the upper reaches of our atmosphere, the energy density of solar radiation is approximately 1,368 W/m2 (watts per square meter). At the Earth's surface, the energy density is reduced to approximately 1,000 W/m2 for a surface perpendicular to the Sun's rays at sea level on a clear day.
5 x 10^20 K cal/year.....is this also can be a answer?
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