The distance between the Earth and the Sun is not constant because Earth's orbit is elliptical.

* Average Distance: 93 million miles (150 million kilometers)

* Perihelion (Closest): 91.4 million miles (147.1 million kilometers)

* Aphelion (Farthest): 94.5 million miles (152.1 million kilometers)

It's often easier to use astronomical units (AU) to describe distances in the solar system. One AU is the average distance between the Earth and the Sun. So:

* 1 AU = 93 million miles

This means that the Earth is about 0.983 AU from the Sun at perihelion and 1.017 AU at aphelion.