Question

i)On which two days are the days and nights equal all over the world and why?What name do you give to these days?
ii)Which is the largest and which is the shortest day inthe Northeren Hemisphere and why?
iii) On which dates does the sun shine vertically overhead at a)Equator,b) Tropic of Cancer, c) Tropic of Capricorn?

ICSE Class 9 Total Geography Ch 3:Rotation and Revolution

Answer 1

Answer- 1. On 21st March and on 23rd September the days and nights are equal because on these days the axis is neither inclined towards the Sun nor away from it. We give these days the name as SPRING EQUINOX and AUTUMN EQUINOX respectively.
2. Largest day in Northern Hemisphere- 22June. Shortest day in Northern Hemisphere-23December. It's largest day because Earth is inclined towards the Sun and shortest day because-Earth is away from Sun.
3. a) 22June. B) 21March. C) 23September.
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Answer 2

Answer:

Explanation:

On 21st march and 23rd september, day and night are equal all over the word because in this teo days the sun shines vertically over the equator i.e at an angle of 90 degree. This angle decreases as one moves away from the equator