Question

Give two reasons for uneven distribution of insolation on the surface of the earth.

Answer 1

The actual amount of insolation received at a place on the earth varies according to the conditions of the atmosphere as well as the seasons. The following astronomical and geographical factors govern the amount of insolation received at any point on the earth's surface:

(1) Angle of incidence (2) Duration of sunshine

(3) Solar constant (4) Distance between the earth and the sun

(5) Transparency of the atmosphere.