How far is the Sun from the Earth?
The distance between the Earth and the Sun is not a constant but varies as the Earth revolves around the Sun. When the Earth is closest to the Sun, it is known as Perihelion and when the Earth is at the maximum distance from the Sun it is known as the Aphelion.
The average distance between the Sun and the Earth over one revolution is approximately equal to 149.6 million kilometers. This is also denoted by 1 astronomical unit or AU. The time taken by light to travel the average distance between the Sun to the Earth has been calculated to be equal to approximately 8 minutes and 19 seconds.
check Approved by eNotes Editorial