How much more difficult? As historian Michele Renee Salzman remarked in "The Cambridge Companion to Ancient Rome," the calendar was so far out of whack by Caesar's time that in 44 B.C., Jan. 1 ...

The ancient Egyptian calendar consisted of 365 days without ... the festival occurred at different times of the year. During the Roman occupation of Egypt from the mid-1st to mid-3rd centuries ...

All in all, the sequence, duration and names of the months we still use today are in great part a result of the perception and insight of the great Roman politician and strategist. In ancient Greece, ...