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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. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

  4. December (Roman month) - Wikipedia

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

    December (from Latin decem, "ten") or mensis December was originally the tenth month of the Roman calendar, following November (novem, "nine") and preceding Ianuarius. It had 29 days. It had 29 days. When the calendar was reformed to create a 12-month year starting in Ianuarius, December became the twelfth month, but retained its name, as did ...

  5. General Roman Calendar - Wikipedia

    en.wikipedia.org/wiki/General_Roman_Calendar

    The General Roman Calendar (GRC) is the liturgical calendar that indicates the dates of celebrations of saints and mysteries of the Lord (Jesus Christ) in the Roman Rite of the Catholic Church, wherever this liturgical rite is in use. These celebrations are a fixed annual date, or occur on a particular day of the week.

  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. Roman timekeeping - Wikipedia

    en.wikipedia.org/wiki/Roman_timekeeping

    The Roman day starting at dawn survives today in the Spanish word siesta, literally the sixth hour of the day (sexta hora). [ 11 ] The daytime canonical hours of the Catholic Church take their names from the Roman clock: the prime , terce , sext and none occur during the first ( prīma ) = 6 am, third ( tertia ) = 9 am, sixth ( sexta ) = 12 pm ...

  8. Ianuarius - Wikipedia

    en.wikipedia.org/wiki/Ianuarius

    The last day of January was the pridie Kalendas Februarias, [a] "day before the Kalends of February". Roman counting was inclusive; January 9 was ante diem V Idūs Ianuarias, "the 5th day before the Ides (13th) of January," usually abbreviated a.d. V Id. Ian. (or with the a.d. omitted altogether); January 23 was X Kal. Feb., "the 10th day ...

  9. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    In other words, the Julian calendar gains 3.1 days every 400 years. Gregory's calendar reform modified the Julian rule, to reduce the average length of the calendar year from 365.25 days to 365.2425 days and thus corrected the Julian calendar's drift against the solar year: the Gregorian calendar gains just 0.1 day over 400 years. For any given ...