he movement of the Earth around the Sun in a fixed orbit is called revolution. One full orbit around the sun is one revolution. The Earth moves around Sun from west to east. The Earth rotates 365 1/4 days to complete one round in one orbit. This period of 365 days is known as a year in our calendar. every 4 years the earth has made one extra rotation. However, one extra day is added to the month of February once in every four years forming a leap year with 366 days. As the Earth revolves the sun, tilts very slightly and so gives us the seasons. The northern of the Earth is a little away from the Sun experiences winter At this time the southern hemisphere is very slightly towards the Sun and the southern hemisphere experiences summer. Winter in Britain means summer in New Zealand. Closer to the Equator there is much less difference between summer and winter.
Phenomenon caused by the Earth, the Sun and the Moon