That is what a soothsayer says to Julius Caesar in Shakespeare’s play. Caesar had reason to be wary of that particular date since that was the day the conspirators planned to assassinate him. Caesar ignored the warning, either out of fatalism or foolhardiness, and his assassination began the course of events that led to the rise of his grand-nephew Augustus and the end of the Roman Republic.
But what are the ides anyway? The Roman calendar was somewhat complicated and was reformed several times in the history of the Republic, until Julius Caesar straighten things out with his Julian calendar. Originally, the Roman calendar seems to have been a lunar calendar with the months corresponding to the lunar cycle. Thus each month began with the New Moon. The Romans did not count days from the beginning of the month, as we do, but instead counted before and after certain key days perhaps corresponding with the phases of the moon. The first day of the month corresponding with the new moon was called the Kalends, from which our word calendar is derived. The ides of the month was the day in the middle of the month, corresponding to the full moon. The ides was either on the thirteenth or fifteenth day depending on whether the month was a long or short one. The nones was eight days before the ides and corresponds to the half moon or first quarter. I would think that they would also make the third quarter of the moon one of the special days but it doesn’t seem to have been.
The day before the kalends, nones, or ides was referred to as the pridie, or the day before in Latin. So, yesterday, March 14, was pridie ides March. Other dates were simply counted back from the nearest reference day. So March 12 would be the the fourth day, ( the reference days were counted) before the ides of March, or a.d. (ante diem) IV id March. March 2 was six days before the nones or a. d VI non. March 25 would be 8 days before the kalends of April, or a. d. VIII kal. This seems to be a rather cumbersome system, having to remember how many days between the kalends and ides, etc, but I suppose the Romans were used to it, and maybe it wasn’t much worse than having to remember which months have thirty or thirty-one days. I’m glad we don’t do that though.
In any case, today is the Ides of March, so if you happen to be Julius Caesar, watch out.
- A Modest Proposal: Universal Time Zones and a Revised Calendar (stoweboyd.com)
- 2016 is a leap year (earthsky.org)
- Explainer: The science behind leap years and how they work (techly.com.au)
- The Calendar (frmilovan.wordpress.com)
- Leap Year 2016: Why does February have 29 days every four years? (telegraph.co.uk)