Question

Why does the sun not appear to twinkle like other stars ?

Answer 1

Sun is very near to earth compared to other stars in the universe. So, the sun appear large and and doesn't twinkle.

Twinkling of celestial bodies (generally stars) is caused by the scattering of light in the earth’s atmosphere. The stars appear twinkling point sources of light because they are very far from earth. The light from stars passes through the layers of air undergoing multiple refractions, this deviates the light from its path and the point source (star) seems to twinkle. Sometimes, when the atmosphere is very stable the stars don’t seem to twinkle. Sometimes, when the atmosphere is very unstable even planets seem to twinkle!