The planets being much closer to Earth are seen as extended sources. If we consider a planet as a collection of a large number of point-sized sources of light, the total variation in the amount of light entering our eyes ...

The planets don’t twinkle because they are much closer to Earth and are seen as extended sources of light. Unlike stars, which are viewed as point-sized sources, planets can be considered as collections of a large number of point-sized sources.

Both the twinkling of stars and the wavering in hot air involve atmospheric refraction, but they occur on different scales. Twinkling is caused by the continuous refraction of starlight through the Earth’s atmosphere, while the local wavering is a result ...

The path of rays of light coming from a star undergoes slight variations due to the continuously changing atmospheric conditions. This fluctuation in the path of light rays results in the apparent position of the star fluctuating, leading to variations ...

The apparent position of a star keeps changing slightly due to the continuously varying physical conditions of the Earth’s atmosphere. This fluctuation in the apparent position, coupled with the fact that stars are distant and approximate point-sized sources of light, ...