What fraction of the Sun's Energy does the Earth Receive?

π=3.141592653589

Surface area of circle =πr^{2}

Radius of Earth = 3,963.19 miles

Area of shadow cast by earth: π(3,963.19)= 49,344,603 sq. miles^{2}Surface area of sphere = 4πr

^{2}

Distance from Earth to Sun: 92,935,700 miles

Surface area of sphere with radius 92,935,700 miles: 108,536,300,119,852,515 sq. milesDivide one by the other and the answer is 0. 000 000 000 454 637

That's 454 trillionths of the sun's energy.

The Earth gets almost half a billionth of the sun's total energy output.

Percentage-wise, the Earth gets 0.0000000454637% or 45 billionths of one percent of the sun's energy.