A star appears appears slightly higher than its actual position in sky draw daigram
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i drawn my level best still for ur clarity there is another pic for u ...
- star seems to be higher in the sky due to atmospheric refraction.
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The gradual change in the refractive index of different layers of the atmosphere due to the varying conditions of it causes atmospheric refraction. When starlight enters the atmosphere, it gets refracted continuously. The higher level of air acts as a rarer medium while the dense air near the surface of earth acts as a denser medium. So, the atmosphere bends the starlight towards the normal. As a result, the apparent position of star is slightly different from its actual position. Thus, star appears slightly higher (above) than its actual position in the sky.
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