In the ancient Roman calendar, the Ides fell in the middle of each month, not just March. The Romans divided months into three key points: the Kalends (first day), the Nones (typically the 5th or ...

Based on these markings, the calendar likely dates to about 150 B.C., the researchers report. Physical evidence of an ancient technology is rare, says professor of Greek and Roman studies John ...

Under the ancient Roman calendar, the Ides referred to the full Moon of any month, which usually occurred between the 12th and 16th. Unlike future versions of the calendar, the Roman calendar is ...