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A perennial calendar is a calendar that applies to any year, keeping the same dates, weekdays and other features. Perennial calendar systems differ from most widely used calendars which are annual calendars. Annual calendars include features particular to the year represented, and expire at the year's end. A perennial calendar differs also from ...
A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future. For the Gregorian and Julian calendars, a perpetual calendar typically consists of one of three general variations: Fourteen one-year calendars, plus a table to show which one-year calendar is to be ...
The International Fixed Calendar (also known as the Cotsworth plan, the Cotsworth calendar, the Eastman plan or the Yearal[ 1] was a proposed calendar reform designed by Moses B. Cotsworth, first presented in 1902. [ 2] The International Fixed Calendar divides the year into 13 months of 28-days each.
This category contains pages in the template namespace. It should not be used to categorize articles or pages in other namespaces. To add a template to this category: If the template has a separate documentation page (usually called "Template: template name /doc"), add. [[Category:Calendar templates]]
To change this template's initial visibility, the |state= parameter may be used: {{Calendars|state= collapsed }} will show the template collapsed, i.e. hidden apart from its title bar. {{Calendars|state= expanded }} will show the template expanded, i.e. fully visible. Editors can experiment in this template's sandbox ( create | mirror) and ...
Perpetual calendar cycle.svg. English: Table showing the 400-year cycle of the 14 possible calendars in the Gregorian calendar, arranged in columns to show a semi-regular 28-year pattern by CMG Lee based on idea by Timwi. The days of week denote the day of week that January 1st of the numbered year falls on. "+" and white text indicate leap years.
The calendar uses a mathematical arrangement to keep a normal 12 month calendar in sync with the moon and keeps the whole system in sync by adding an intercalary month every 2 + 1 ⁄ 2 years. The Coligny calendar registers a five-year cycle of 62 lunar months , divided into a "bright" and a "dark" fortnight (or half a moon cycle) each.
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).
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