Here's why:

* Stars: Stars are so far away that their positions in the sky appear relatively unchanging over human lifetimes. They seem fixed.

* Planets: Planets are much closer to Earth and orbit the sun. As they orbit, they change their position in the sky relative to the stars.

* Slow Movement: This movement is slow, but noticeable over time. Ancient astronomers observed this movement and dubbed these celestial objects "wanderers" because they didn't follow the predictable patterns of the stars.

This distinction between stars and planets continued until the development of modern astronomy, where the concept of planets orbiting the sun became understood.

In essence, the name "wanderer" is a testament to our early understanding of the cosmos and how we perceived these celestial bodies.