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Thirty Days Hath September", or "Thirty Days Has September", [1] is a traditional verse mnemonic used to remember the number of days in the months of the Julian and Gregorian calendars. It arose as an oral tradition and exists in many variants. It is currently earliest attested in English, but was and remains common throughout Europe as well. Full:
The conjunction of Sun and Moon ("new moon") is most likely to fall on the preceding day, which is day 29 of a "hollow" (29-day) month and day 30 of a "full" (30-day) month. Historically, in Beda Venerabilis' Easter cycle , the paschal full moon date for a year was found from its sequence number in the Metonic cycle, called the golden number ...
To avoid confusion and further mistakes, the Julian calendar was restored in 1712 by adding an extra leap day, thus giving that year the only known actual use of February 30 in a calendar. That day corresponded to February 29 in the Julian calendar and to March 11 in the Gregorian calendar. [5] [6] The Swedish conversion to the Gregorian ...
30: April Maius: 31: 31: 31: May Iunius [3] 29: 29: 30: ... The net effect was to add 22 or 23 days to the year, ... The date of introduction, the day after 14 ...
The most common way to reconcile the two is to vary the number of days in the calendar year. In solar calendars, this is done by adding an extra day ("leap day" or "intercalary day") to a common year of 365 days, about once every four years, creating a leap year that has 366 days (Julian, Gregorian and Indian national calendars).
The Meyer–Palmen Solilunar Calendar has 12 lunar months with 29 or 30 days plus a leap month called Meton every 3 or 2 years with 30 or 31 days. 60 years together are called a cycle. It uses a leap cycle which has equal number of days, weeks, months, years and cycles. 2498258 days, 356894 weeks, 84599 months, 6840 years and 114 cycles nearly ...
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Each leap year, the month of February has 29 days instead of 28. Adding one extra day in the calendar every 4 years compensates for the fact that a period of 365 days is shorter than a tropical year by almost 6 hours. [7] However, this correction is excessive and the Gregorian reform modified the Julian calendar's scheme of leap years as follows: