Ganymede's distance from the Sun varies because it orbits Jupiter, which itself orbits the Sun in an elliptical path.

Here's a breakdown:

* Average Distance: Ganymede's average distance from the Sun is about 778 million kilometers (484 million miles). This is the same as Jupiter's average distance from the Sun, since Ganymede orbits Jupiter.

* Range: Due to Jupiter's elliptical orbit, Ganymede's distance from the Sun can range from 741 million km (460 million mi) at its closest point (perihelion) to 816 million km (507 million mi) at its farthest point (aphelion).

It's important to remember that Ganymede's distance is relative to Jupiter's position, and the numbers above reflect the combined distance from the Sun to Jupiter and then to Ganymede.