Take an umbrella and open it. Make about 10-15 stars out of white

paper. Paste one star at the position of the central rod of the umbrella

and others at different places on the cloth near the end of each spoke.

Now rotate the umbrella by holding its central rod in your hand.

Observe the stars on the umbrella. Is there any star which does not

appear to move? Where is this star located? If there was a star located

where the axis of rotation of the Earth meets the sky, could this star

also be stationary? Observe and record your findings.​