Variations in the length of daytime and night time from season to season are due to :
✓ Correct answer: d) Revolution of the earth on a tilted axis
ExplanationThe variations in the length of daytime and nighttime throughout the year are primarily caused by the Earth’s revo- lution around the Sun on a tilted axis.The Earth’s axis is tilt- ed at an angle of approximately 23.5° relative to its orbital plane around the Sun.This tilt causes different parts of the Earth to receive varying amounts of sunlight during different times of the year, leading to the changing lengths of days and nights.During the Winter Solstice (around 21st December), the Southern Hemisphere is tilted towards the Sun, causing the Northern Hemisphere to experience the shortest day and the longest night.The Equinoxes (around 21st March and 22nd September) occur when the Earth’s axis is not tilted towards or away from the Sun, resulting in approximately equal day and night lengths.7 Geography UPSC GS Paper-I PYQs 340 6
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