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  2. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    The original Roman calendar is usually believed to have been an observational lunar calendar [2] whose months ended and began from the new moon. [3] [4] Because a lunar cycle is about 29.5 days long, such months would have varied between 29 and 30 days. [5]

  3. Martius (month) - Wikipedia

    en.wikipedia.org/wiki/Martius_(month)

    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.

  4. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.

  5. December (Roman month) - Wikipedia

    en.wikipedia.org/wiki/December_(Roman_month)

    The Romans did not number days of a month sequentially from the first day through the last. Instead, they counted back from the three fixed points of the month: the Nones (5th or 7th), the Ides (13th or 15th), and the Kalends (1st) of the following month. The Nones of December was the 5th, and the Ides the 13th.

  6. Calends - Wikipedia

    en.wikipedia.org/wiki/Calends

    Modern calendars count the number of days after the first of each month; by contrast, the Roman calendar counted the number of days until certain upcoming dates (such as the calends, the nones or the ides). The day before the calends was called pridie kalendas, but the day before that was counted as the "third day", as Romans used inclusive ...

  7. Ianuarius - Wikipedia

    en.wikipedia.org/wiki/Ianuarius

    Ianuarius, Januarius, or January, fully Mensis Ianuarius ("month of Janus") and abbreviated Ian., was the first month of the ancient Roman calendar, from which the Julian and Gregorian month of January derived. It was followed by Februarius ("February"). In the calendars of the Roman Republic, Ianuarius had 29 days.

  8. Sextilis - Wikipedia

    en.wikipedia.org/wiki/Sextilis

    August panel from a Roman mosaic of the months (from El Djem, Tunisia, first half of 3rd century AD) Sextilis (lit. ' sixth ') or mensis Sextilis was the Latin name for what was originally the sixth month in the Roman calendar, when March (Martius, "Mars' month") was the first of ten months in the year. After the calendar reform that produced a ...

  9. September (Roman month) - Wikipedia

    en.wikipedia.org/wiki/September_(Roman_month)

    September (from Latin septem, "seven") or mensis September was originally the seventh of ten months on the ancient Roman calendar that began with March (mensis Martius, "Mars' month"). It had 29 days. After the reforms that resulted in a 12-month year, September became the ninth month, but retained its name.