About: Bissextus

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Bissext, or bissextus (from Latin bis 'twice', and sextus 'sixth') is the 'leap day' which is added to the Julian calendar and the Gregorian calendar every fourth year to compensate for the six-hour difference in length between the common 365-day year and the actual length of the solar year. (The Gregorian calendar omits this leap day in years evenly divisible by 100, unless they are divisible by 400) Section II of the Calendar (New Style) Act 1750 contains the new Gregorian rule for determining leap years in the future. Be it further enacted by the Authority aforesaid,

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  • Bissext, or bissextus (from Latin bis 'twice', and sextus 'sixth') is the 'leap day' which is added to the Julian calendar and the Gregorian calendar every fourth year to compensate for the six-hour difference in length between the common 365-day year and the actual length of the solar year. (The Gregorian calendar omits this leap day in years evenly divisible by 100, unless they are divisible by 400) Originally, the day was inserted after 24 February, i.e. the 6th day before the calends (1st) of March, Consequently, besides the sextus, or sixth before the calends, the bis-sextus or "second sixth," was 25 February. In modern usage, with the exception of ecclesiastical calendars, this intercalary day is added for convenience at the end of the month of February, as 29 February, and years in which February has 29 days are called "bissextile," or leap years. Section II of the Calendar (New Style) Act 1750 contains the new Gregorian rule for determining leap years in the future. Be it further enacted by the Authority aforesaid, That the several Years of our Lord, 1800, 1900, 2100, 2200, 2300, or any other hundredth Years of our Lord, which shall happen in Time to come, except only every fourth hundredth [sic] Year of our Lord, whereof the Year of our Lord 2000 shall be the first, shall not be esteemed or taken to be Bissextile or Leap Years, but shall be taken to be common Years, consisting of 365 Days, and no more; and that the Years of our Lord 2000, 2400, 2800, and every other fourth hundred Year of our Lord, from the said Year of our Lord 2000 inclusive, and also all other Years of our Lord, which by the present Supputation are esteemed to be Bissextile or Leap Years, shall for the future, and in all Times to come, be esteemed and taken to be Bissextile or Leap Years, consisting of 366 Days, in the same Sort and Manner as is now used with respect to every fourth Year of our Lord. (en)
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  • Bissext, or bissextus (from Latin bis 'twice', and sextus 'sixth') is the 'leap day' which is added to the Julian calendar and the Gregorian calendar every fourth year to compensate for the six-hour difference in length between the common 365-day year and the actual length of the solar year. (The Gregorian calendar omits this leap day in years evenly divisible by 100, unless they are divisible by 400) Section II of the Calendar (New Style) Act 1750 contains the new Gregorian rule for determining leap years in the future. Be it further enacted by the Authority aforesaid, (en)
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  • Bissextus (en)
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