Variations in the length of daytime and night times from season to season are due to

Variations in the length of daytime and night times from season to season are due to ( UPSC CSE 2013)

1. The earth’s rotation on its axis
2. The earth’s revolution around the sun in an elliptical manner
3. Latitudinal position of the place
4. Revolution of the earth on a tilted axis

Answer: D

Explanation

The variation in the length of daytime and night-time from season to season is mainly due to the tilt of the Earth’s axis (about 23 1⁄2°) along with its revolution around the Sun. Because the Earth’s axis is tilted, different hemispheres receive unequal amounts of solar radiation at different times of the year. As the Earth revolves around the Sun, the angle at which the Sun’s rays strike the Earth and the duration for which they illuminate a particular region keep changing. This leads to longer days and shorter nights during summer in the hemisphere tilted towards the Sun, and shorter days and longer nights during winter when the hemisphere is tilted away from the Sun.

Sharing is caring!