Solar energy is a radiant energy produced in the sun as a result of nuclear fusion reactions.
It is transmitted to the earth through space in quanta of energy called photons, which interact with the earth s atmosphere and surface. The strength of solar radiation at the outer edge of the earth s atmosphere when the earth is at its average distance from the sun is called the solar constant. The amount and strength of the solar energy available at any point on the earth depends on the day of the year, time of day, the latitude of the collection point, and the orientation of the object used in collection. The earth is rich in abundant natural resources. However, the earth s natural resources are being consumed at an astronomical rate.