The Roman Empire developed out of Paganism into what came to be called Christendom. The Julian Calendar, revised by Augustus, though Pagan in origin, continued to make headway. On its merits it was accepted as the standard measure of time in the Western World. The persistence of this calendar is simply explained. It excludes the moon and gives to civilization its place in the sun.
Thus begins Chapter 15 of The Romance of the Calendar; the chapter is titled “Revolt of Islam.”
It’s a short chapter. We’ll skim through it tomorrow.