Insolation/ Solar Radiation

Incoming solar radiation is known as Insolation and it is received in the form of short waves. The earth's surface receives the radiant energy at the rate of 2 calories per sq. cm. per minute.

Factors affecting the Distribution of Insolation

  • Distance between Earth & Sun: The average distance between these two bodies is about 149 million km.
    • On January 3 the earth comes closer to the sun, called "perihelion". On July 4, the earth is little farther from the sun and this position is called ‘aphelion’.
    • Hence the amount of incoming solar radiation is about 7 per cent more in ....
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Geography Of India