Hi, a novice astronomer here. Was just looking at some stars/galaxies/planets the other day, and followed up some observations by looking at their locations (on wikipedia). I noticed that for stars/galaxies there are a range of different coordinate/location systems used, although the celestial coordinate system seems the most common (e.g. 13h 23.7m xxs etc). My question is thus, what is the convention for denoting the location/coordinates of planets/the moon? Since they are continuously moving, as are we on Earth, is there a dedicated system to describe their location? Also as an aside, does the same happen with galaxies/stars? Because they are further away does their coordinate location change but by smaller magnitudes? Basically why can't the celestial coordinate system be used to locate planets/the moon?