👉 The movement of the earth around the sun in a fixed path or orbit is called Revolution.
👉 It takes 365 days 6 hours to revolve around the sun.
👉 We consider a year as consisting of 365 days only and ignore 6 hours for the sake of convenience.
👉 Six hours saved every year are added to make one day over a span of 4 years. This surplus day is added to the month of February. That’s why every fourth year, February is 29 days instead of 28 days. Such a year with 366 days is called a LEAP YEAR.
👉 The earth moves around the sun in an elliptical orbit.
👉 Due to the change in the position of the earth around the sun seasons changes.
👉 A year is usually divided into summer, winter, spring, and autumn seasons.