NCERT Solutions Curiosity Chapter 12 .1 Rotation of the Earth — Activity 12.1: Let us explore

Book page 17012 Updated on2026-09-05

Q1.
While you are sitting on the moving merry-go-round, look around you. Do the objects around you appear to be moving? In which direction do they appear to be moving?
Answer

Yes, everything around you appears to move — and it appears to move in the direction opposite to your own turning.

You are sitting facing outwards while a friend turns the merry-go-round slowly in the anti-clockwise direction. The benches, the trees, the school building and the sky all seem to sweep past you in the clockwise direction.

Merry-go-round turnsSurroundings appear to turnWhat is really moving
Anti-clockwiseClockwiseYou (with the merry-go-round)
ClockwiseAnti-clockwiseYou (with the merry-go-round)
Why it happens: your eyes cannot see your own turning; they only register that the direction in which each object lies keeps changing. The brain reads that change as "the object moved". The apparent motion is always in the opposite sense to the real motion of the observer.
Q2.
In which direction do you find the tree turning around you? Is it in your view all the time?
Answer

The tree appears to turn around you in the clockwise direction — that is, opposite to your anti-clockwise turning. And no, it is not in your view all the time.

The tree appears on your left-hand side, sweeps across in front of you, and goes out of view on your right-hand side. Then, for a part of every turn, it is behind you and you cannot see it at all. A little later it reappears on the left, and the cycle repeats.

Why this matters for the chapter: replace the merry-go-round by the Earth and the tree by the Sun. The Earth turns anti-clockwise as seen from above the North Pole, so for a person on the equator the Sun appears on the left-hand (eastern) side, crosses the sky, and disappears on the right-hand (western) side. The time when it is out of view is night, and the whole cycle takes about 24 hours.
Tip: do this activity slowly and with someone holding the merry-go-round steady. If you feel giddy, stop and look at a fixed point on the ground.
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