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  • Is the position of a star as seen by us its true position? Justify your answer.

Is the position of a star as seen by us its true position? Justify your answer.

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Ans.
The light of stars undergoes refraction continuously on entering the earth's atmosphere, before it reaches the earth. The atmospheric refraction occurs in a medium of gradually changing refractive index.
The atmosphere bends starlight towards the normal, so the apparent position of the star is slightly different from its actual position. So the apparent position of the star changes or fluctuates.
So, the position of a star as seen by us is not its true position. 
Thus, star appears slightly higher than its actual position

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