When Jupiter is in the sky it is always visible, for us the sun is the brightest object, the moon next then venus and then jupiter. venus is always near one horizon or other, jupiter is always good to look at, through binoculars you can see its stunning set of moons all strung in a line. like the moon the light we see is sunlight reflected off it, it just happens that it is close to where the moon is at the moment.
all the planets follow the path across the sky called the ecliptic, the moon does so to but wanders above and below its line. each day the moon moves further east with respect to the planets, such that every month we get the phases of the moon, the planets also move with respect to the stars, but much slower, so there can be periods when jupiter isnt visible, as with all the planets, these all revolve around the sun at different time intervals, so you can get times when they are all visible and lined up.
Grendel