Question

A star sometimes appears brighter and some other times fainter. What is this effect called?

State the reason for this effect.​

Answer 1

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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.

Answer 2

Explanation:

A star sometimes appears brighter and some other times fainter. ... A star sometimes appears brighter and some other times fainter because of twinkling effect. Atmospheric refraction gives rise to twinkling effect