Jupiter is jovial, happy, loves to life life to the full, expansive, over the top, larger than life and sometimes goes a little too far! In Latin, the day was known as Iovis Dies, "Jupiter's Day" - Jupiter is Jove (in greek we know him as Zeus) the king of the gods associated with thunder, lightning and the sky, often depicted with a thunderbolt wielding his role as the ruler of the heavens.