Modern scholars have pretty much decided that the star the Magi saw was an alignment of planets much like we saw right before Christmas in our own sky. Jupiter was thought of as the royal or kingly planet and many thought Saturn represented the Jews. When the Magi saw Jupiter and Saturn in alignment with another planet or two, they concluded the obvious; the new king of the Jews was about to be born.
So, the Magi, who were astronomers and astrologers, saw the “star” and determined that a king (represented by Jupiter) of the Jews (represented by Saturn) had been born and headed out for Jerusalem the city of the Jews. There is much that we can learn from their journey.
Matthew 2:1-12