The star of Bethlehem has puzzled scholars for centuries. Some have skeptically dismissed the phenomenon as a myth, a mere literary device to call attention to the importance of the Nativity. Others have argued that the star was miraculously placed there to guide the Magi and is therefore beyond all natural explanation. Most authorities, however, take a middle course which looks for some historical explanation for the Christmas star, and several interesting theories have been offered. The astronomer Kepler noted in the early 17th century that every 805 years, the planets Jupiter and Saturn come into extraordinary repeated conjunction, with Mars joining the configuration a year later. Since Kepler, astronomers have computed that for ten months in 7 B.C., Jupiter and Saturn traveled very close to each other in the night sky, and in May, September, and December of that year, they were conjoined. Mars joined the configuration in February of 6 B.C. The astrological interpretation of such a conjunction would have told the Magi much, if, as seems probable, they shared the astrological lore of the area. Jupiter and Saturn met each other in Pisces, the Fishes.
In ancient astrology, the giant planet Jupiter was styled the "King's Planet," for it represented the highest god and ruler of the universe: Marduk to the Babylonians; Zeus to the Greeks; Jupiter to the Romans. The ringed planet Saturn was deemed the shield or defender of Palestine, while the constellation of Pisces, which was also associated with Syria and Palestine, represented epochal events and crises. So Jupiter encountering Saturn in the sign of the Fishes would have meant that a divine and cosmic ruler was to appear in Palestine at a culmination of history.
Bill Petro, your friendly neighborhood historian