DO NOT FORGET to go out tonight, Winter Solstice evening Monday the 21st, and see the much-talked-about conjunction of Saturn and Jupiter. They have not been in this alignment (that is visible to us Earthlings) for 800 years! This treat will be visible in the Southwest for a couple hours after sunset. It might take a little time identify these two with the naked eye as they will be very close together and may look like ONE star instead of two close together planets! Binoculars will be a big help.
In my photos from the previous two nights Jupiter is on the bottom of its pairing but will switch positions with Saturn after tonight.
Jupiter’s four largest moons are Io, Europa, Ganymede, and Callisto, in order of distance from Jupiter. They are faintly visible in my top photo stretching out from the 11:00 o’clock position (Io and Europa are almost on top of each other.) At latest count Jupiter has 67 moons but the big four were discovered by Galileo in 1610 and are called, fittingly, the Galilean moons.