* Ganymede doesn't have its own "solar year" in the way we understand it. A solar year is the time it takes for a planet to complete one orbit around its star (the Sun in our case).

* Ganymede orbits Jupiter, not the Sun. So, it experiences a "Jovian year," which is the time it takes to orbit Jupiter once.

Ganymede's Jovian year is about 7.15 Earth days long.

It's important to note that Ganymede also experiences its own day-night cycle based on its rotation. Ganymede rotates once every 7.15 Earth days, so it has a synchronous rotation with Jupiter, meaning the same side of Ganymede always faces Jupiter.