The Great Disappointment in the Millerite movement was the reaction that followed Baptist preacher William Miller's proclamations that Jesus Christ would return to the Earth by 1844, what he called the Advent. His study of the Daniel 8 prophecy during the Second Great Awakening led him to the conclusion that Daniel's "cleansing of the sanctuary" was cleansing of the world from sin when Christ would come, and he and many others prepared, but October 22, 1844 came, and they were disappointed.