Priests and Popes and Caesar, Oh My: Evolution of the Modern Calendar

When the doctor asks you when your last period was. Photo by the Pantograph

Marking the passage of time preoccupied our ancestors from the moment they looked to the heavens and wondered WTF. The never-ending journey of the sun, moon, and stars across the great expanse of sky reveals numerous methods of marking time, the most obvious to primitive humans being the passage of a day, and of a month.