It could be possible that the Object orbits past between the Earth and Moon at a slightly further out position every orbit. With every more distant orbit or crossing point, the final evolution of the scene and the action within and inside up through the oval shaped plain of Lasting Light may have been expected to be progressively different compared to the previous return and Lasting Light event.
It could also be possible that perhaps some of the ancient writer's may have been trying to predict what sorts of sights could be expected to be seen during or towards the end of the their next, Return and Lasting Light event and also Returns in the distant future.
The Lasting Light event that the Object causes may follow a predictable cycle or changing pattern that directly relates to the orbital characteristics of the Object.
If the knowledge of what happened before, was known, then a writer past or present, would be able to say what was going to happen during the next Return and Lasting Lig