The planets move slowly relative to the background stars. So if you were to go outside every night at the same time you would see Jupiter in a little bit different position relative to the stars around it. Right now Jupiter is in the east and getting higher night by night. This is partly due to the earth moving which is causes stars (and Jupiter) to rise earlier every night. This is the normal seasonal change in what stars are visible at a given time. But Jupiter is also moving so it's advancing a little faster than the stars at present. This is why you would not necessarily have seen it prominently in that part of the sky last year at this time (for instance). The planets used to be referred to as wandering stars. Long before people understood they were not fundamentally the same thing as stars they still noticed that they moved differently than the other stars.