Intensity of Sun's Radiation Reaching Earth

The distance between the Earth and the Sun varies between  
\[d_1 = 147.1\]
  and  
\[d_2 = 152.1\]
  million km.
The luminosity of the Sun - the total power output - is  
\[I=3.846 \times 10^{26}\]
  W.
This means that the intensity of the Sun's radiation reaching the Earth varies between
\[\frac{I}{4 \pi d_1^2} = \frac{3.846 \times 10^{26|}}{4 \pi (147.1 \times 10^6)^2} = 1414 W/m^2\]

and
\[\frac{I}{d_2^2} = \frac{3.846 \times 10^{26|}}{4 \pi (152.1 \times 10^6)^2} = 1.323 W/m^2\]

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