A student was asked a question why are there summer and winter for us? He replied as since Earth is orbiting in an elliptical orbit. When the Earth is very far away from the Sun(aphelion) there will be winter, when the Earth is nearer to the Sun(perihelion) there will be winter. Is this answer correct? If not, what is the correct explanation for the occurrence of summer and winter?

Explanation

No, The season in the Earth around the sun with `23.5^(@)` Tilt. Due to this `23.5^(@)` Tilt, when the northern part of Earth is farther to the sun, the southern part is nearer to the sun. So When it is summer in the northern hemisphere, the southern hemisphere experience winter.