It all starts out with the sun going down and "great lights in heaven" (Helaman 14:3) keeping things as bright as day. Then we get the Star of Bethlehem showing up sometime later.
The story makes wonderful sense until you stop to think about it. Why does the Bible not mention a night as bright as day? Were the "great lights" Samuel the Lamanite spoke of, like, angels acting as nightlights or something? Third Nephi doesn't say. Why would Herod's astrologers be the only assholes able to see and understand the significance of a mega-bright star showing up in the sky? Why should we believe that star-reading, horoscoping assholes had any valuable insight about the future at all, ever? Why would said astronomers need a star to travel ten miles down the road, anyway? Why doesn't Samuel the Lamanite give any instructions on how to read the "many signs and wonders in heaven" (Helaman 14:6)? Is a new savior being born every time a supernova pops or a meteor shower hits? Does God really relay messages of truth through the stars? If so, it would seem that modern-day astronomers and modern-day prophets are both having a hell of a time making heads or tails of what God's trying to tell us via astroscript.
What if it's all just a fun story? What if The Book of Mormon is just another fun story based off of a fun story or two?