PDF chapter test TRY NOW
- 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.
Rotating the umbrella
Is there any star which does not appear to move?
, the in the sky does not move at all.
Where is this star located? If there were a star located where the axis of rotation of the Earth meets the sky, could this star also be stationary?
It is situated in the , and . This star is also known as . It is visible only from the hemisphere.
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