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Ides (calendar), a day in the Roman calendar that fell roughly in the middle of the month.In March, May, July, and October it was the 15th day of the month; in other months it was the 13th
The Romans did not number each day of a month from the first to the last day. Instead, they counted back from three fixed points of the month: the Nones (the 5th or 7th, eight days before the Ides), the Ides (the 13th for most months, but the 15th in March, May, July, and October), and the Kalends (1st of the following month).
The nundinal cycle and a few known synchronisms—e.g., a Roman date in terms of the Attic calendar and Olympiad—are used to generate contested chronologies back to the start of the First Punic War in 264 BC. Beyond that, dates are roughly known based on clues such as the dates of harvests and seasonal religious festivals.
To calculate the day of the calends of the upcoming month, counting the number of days remaining in the current month is necessary, then adding two to that number. For example, April 22 is the 10th day before the calends of May (ante diem decimum Kalendas Maius), because eight days are left in April and both end dates are included in the total. [1]
The Romans did not number days of a month sequentially from the 1st through the last day. Instead, they counted back from the three fixed points of the month: the Nones (5th or 7th, depending on the length of the month), the Ides (13th or 15th), and the Kalends (1st) of the following month. The Nones of January fell on the 5th, and the Ides on ...
9: Agonalia in honor of Janus, after whom the month January is named; first of at least four festivals named Agonalia throughout the year; 11 and 15: Carmentalia, with Juturna celebrated also on the 11th; 13 (Ides) 24–26: most common dates for the Sementivae, a feriae conceptivae of sowing, perhaps also known as the Paganalia as celebrated by ...
Date Name Other names Observed in Description Ref. March 15: Ides of March ... January 6, 2021: January 6 United States Capitol attack: January 6th:
Microsoft Excel displays the day before January 1, 1900 (the earliest date it can represent) as January 0, 1900. [17] It also treats 1900 incorrectly as a leap year (whereas only centuries divisible by 400 are), so it displays the day before March 1, 1900, as the non-existent February 29 instead of February 28. This means March 1, 1900 is the ...