What is insolation?

Sun is the primary source of energy. All the science behind the universe is based on the sun. Planets rotation and revolution can all be considered based on the sun. So suns plays a significant role in the entire solar system.


The sun radiates its energy in every direction into space in short wavelengths, which is referred to as solar radiation. The energy received by the earth’s surface in the form of short waves is termed as Incoming Solar Radiation or Insolation. The amount of insolation sustained on the earth’s surface is far less than that is radiated from the sun because of the small size of the earth and its distance from the sun. The temperature of a place is determined by the insolation received.
The insolation differs according to the latitude, therefore, the temperature also differs consequently.

Factors influencing Insolation

The amount of insolation sustained on the earth’s surface is not uniform throughout. It differs according to the place and time. When the tropical regions receive maximum annual insolation, it gradually diminishes towards the poles. Insolation is more major in summers and less in winters.

The major factors which influence the amount of insolation received are:

  • Rotation of the earth on its axis
  • The angle of incidence of the sun’s rays
  • Duration of the day
  • Transparency of the atmosphere

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