It was a star that guided the three Wise Men

“According to Christian tradition it was a star that had guided the three Wise Men (who in the original Greek are called astrologers) to Bethlehem... The consensus of opinion among modern astrologers is that the ‘star’ of Bethlehem was in fact a conjunction of Jupiter and Saturn in Pisces... an exceptional phenomenon that the Wise Men would have considered a major omen”~Larousse Encyclopedia of Astrology