Question

altitude of the sun varies at a place according to seasons.why?

Answer 1

Because of the spherical shape of the earth and the revolution of the earth.
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Answer 2

Answer.....

This is because of the tilt of the Earth's axis. During the summer the northern hemisphere is tilted towards the sun so it has summer and southern Hemisphere has winter it, and during the winter it tilts the opposite way so the southern Hemisphere has summer and northern hemisphere has winter.This also make's the suns altitude appear to change,as we move towards and away from it.....

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