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The Gregorian calendar is currently used by most of the world. There is also an international standard describing the calendar, ISO 8601, with some differences from traditional conceptions in many cultures. Since the papal reform in 1582, several proposals have been offered to make the Gregorian calendar more useful or regular.
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.
The bull, canons, and calendars were reprinted as part of the principal book explaining and defending the Gregorian calendar, Christoph Clavius, Romani calendarii a Gregorio XIII. P. M. restituti explicatio (1603), [5] which is tome V in his collected works Opera Mathematica (1612).
The International Fixed Calendar (also known as the Cotsworth plan, the Cotsworth calendar, the Eastman plan or the Yearal) [1] was a proposed reform of the Gregorian calendar designed by Moses B. Cotsworth, first presented in 1902. [2] The International Fixed Calendar divides the year into 13 months of 28 days each.
The Gregorian calendar was a reform of the Julian calendar, instituted by Pope Gregory XIII in 1582 by the papal bull " Inter gravissimas" ("Among the most serious "). The intention expressed by the text of this bull was to reset the calendar so that celestial events critical for the calculation of Easter dates—the March equinox and its ...
However, more than a century passed before Protestant Europe accepted the new calendar. Denmark-Norway, the remaining states of the Dutch Republic, and the Protestant states of the Holy Roman Empire and Switzerland adopted the Gregorian reform in 1700–01. By that time, the calendar trailed the seasons by 11 days.
The Hanke–Henry Permanent Calendar (HHPC) is a proposal for calendar reform. It is one of many examples of leap week calendars, calendars that maintain synchronization with the solar year by intercalating entire weeks rather than single days. It is a modification of a previous proposal, Common-Civil-Calendar-and-Time (CCC&T). With the Hanke ...
In 1905, Searle published his idea for a possible reform of the Gregorian Calendar. The plan was to have every new year beginning on Sunday, in order to achieve a perennial calendar. In common years, the new calendar would have 52 weeks exactly, or 364 days, with February shortened to 27 days. In leap years, there would be 53 weeks, or 371 days.