Helaman 12:14–15 shows that Mormon had a basic understanding of the physical laws of the universe: “Reference is here made to the biblical account that shows Joshua commanding the sun and the moon to stand still so that his army might complete their rout of the Amorites (Joshua 10:12–14). Here a corrective note is added to that account, which supposed the sun to rotate around a stationery earth. (See also Isaiah 38:7–8; 2 Kings 20:8–11.) These verses provide a subtle but certain assurance that the prophet-editor Mormon, like many of the ancient spiritual leaders, was anything but primitive in his understanding concerning God, man, and the universe” (Joseph Fielding McConkie and Robert L. Millet, Doctrinal Commentary on the Book of Mormon, 4 vols. [1987–91], 3:397).