Roman Calendar notes

The document summarizes the Roman calendar system. It discusses the Kalends, Nones, and Ides, which fell on the 1st, 5th/7th, and 13th/15th of each month respectively. It then explains how Romans counted inclusively backward from these dates to specify a date, such as "6 days before the Ides of March." Finally, it provides Latin terms like a.d. and pridie to denote dates before the Kalends, Nones, or Ides and gives examples of converting English dates to their Roman equivalents.