What is meant by the Revolution of the Earth? What are its effects?

The motion of the earth along its elliptical orbit around the Sun in approximately 365 1/4 days (365.25 days) is termed as Revolution.

The effects of revolution are as follows:

1. Occurrence of different seasons.
2. It causes Spring and Autumn Equinoxes.
3. It causes Summer and Winter Solstice.
4. Changing altitude of the mid-day sun at different times of the year.