The twinkling effect of a star is directly caused by starlight entering the eye
Question
The twinkling effect of a star is directly caused by starlight entering the eye
the star's actual physical pulsing every second
fluctuation in the star's apparent position and the resulting flicker in the amount of
the Moon periodically blocking the star
clouds passing in front of the star only
Answer
fluctuation in the star's apparent position and the resulting flicker in the amount of
Detailed Explanation
The chapter explains that as the star's apparent position fluctuates due to atmospheric refraction, the amount of light entering the eye flickers, causing the twinkling effect.