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Red maple (Acer rubrum) leaf in October (Northern hemisphere).October is the tenth month of the year in the Julian and Gregorian calendars.Its length is 31 days. The eighth month in the old calendar of Romulus c. 750 BC, October retained its name (from Latin and Greek ôctō meaning "eight") after January and February were inserted into the calendar that had originally been created by the Romans.
Many know that the prefix oct- means eight, as in octopus or octagon. But why does October, the 10th month of the year, have this prefix?
October (from Latin octo, "eight") or mensis October was the eighth of ten months on the oldest Roman calendar. It had 31 days. October followed September (from septem, "seven") and preceded November (novem, "nine"). After the calendar reform that resulted in a 12-month year, October became the tenth month, but retained its numerical name, as ...
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]
The need to correct the calendar arose from the realisation that the correct figure for the number of days in a year is not 365.25 (365 days 6 hours) as assumed by the Julian calendar but slightly less (c. 365.242 days). The Julian calendar therefore has too many leap years.
Swedish calendar for February 1712. February 30 or 30 February is a date that does not occur on the Gregorian calendar, where the month of February contains only 28 days, or 29 days in a leap year. However, from a historical perspective February 30 has been used at least once and appears in some reform calendars.
The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.
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