There are many reasons why Revelation should not be treated as an exclusively chronological timeline of events. There is some chronology, but there are also a lot of intertwined visions with overlaps. For instance the Beast from the Sea in chapter 13 is the Roman empire. But the Whore riding the Dragon in chapter 17 with it's seven kings is also a depiction of the same Roman empire. Next, the vision of the Woman with the 12 Stars (chapter 12) is about (true) Israel giving birth to Jesus and being persecuted by the dragon (devil/Roman Empire). It ENDS with the Woman being kept safe for 1260 days. The Vision of the Two Witnesses (chapter 11) STARTS with a period of 42 months or 1260 days. Whatever your interpretation is of the Vision of the Two Witnesses (chapter 11), it happens AFTER that of the Woman with the 12 Stars (chapter 12), but it is written BEFORE it. There are many repetitions. Another reason is that there are many repetitions of the same event. Babyl