That statement is incorrect. Earth's distance from the sun does change as it moves in its orbit.

Here's why:

* Earth's orbit is elliptical, not perfectly circular. This means Earth's distance from the sun varies throughout the year.

* Perihelion: Earth is closest to the sun in early January (around 147.1 million kilometers).

* Aphelion: Earth is furthest from the sun in early July (around 152.1 million kilometers).

The difference in distance between perihelion and aphelion is about 5 million kilometers, which is about 3% of the average distance. While this difference may seem small, it does have some impact on the seasons, though not as much as the tilt of Earth's axis.