Delve into the historicist interpretation of the fifth and sixth trumpets of Revelation 9, as understood by Adventist pioneers like Uriah Smith and Josiah Litch. Connect the symbolism of the falling star, locusts, and the angel of the bottomless pit (Abaddon/Apollyon) to the rise of Mohammedanism and the Ottoman Empire. Trace the prophetic time periods—the 150 years (“five months”) of tormenting the Byzantine Empire (1299-1449) and the 391 years and 15 days (“an hour, day, month, and year”) of its supremacy, culminating in the predicted fall of Ottoman power on August 11, 1840. Understand how this fulfillment confirmed the day-year principle and fueled the Millerite movement, leading into the significance of the seventh trumpet beginning in 1844 with Christ’s ministry in the Most Holy Place.