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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 Doomsday rule, Doomsday algorithm or Doomsday method is an algorithm of determination of the day of the week for a given date. It provides a perpetual calendar because the Gregorian calendar moves in cycles of 400 years. The algorithm for mental calculation was devised by John Conway in 1973, [1][2] drawing inspiration from Lewis Carroll 's ...
Jasper Goodykoontz as he appeared in the 1894 Goodykoontz's Perpetual Calendar and General Reference [1] Jasper Goodykoontz (January 10, 1855, Indiana – September 1, 1923, Flint, Michigan) was the creator or Goodykoontz's Perpetual Calendar and General Reference: A Book for the Millions. Each issue was hundreds of pages of hand-drawn and hand ...
Old Style (O.S.) and New Style (N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in various European countries between 1582 and 1923. In England, Wales, Ireland and Britain's American colonies, there were two calendar ...
A Runic calendar (also Rune staff or Runic almanac) is a perpetual calendar, variants of which were used in Northern Europe until the 19th century. A typical runic calendar consisted of several horizontal lines of symbols, one above the other. Special days like solstices, equinoxes, and celebrations (including Christian holidays and feasts ...
TX perpetual calendar watches provide accurate day, month and date until 2100, account for short months and leap years, and require no adjustment on months with less than 31 days. They also feature retrograde dials, where a hand moves, for example, from day to day (of the week) and then back to the original position after Sunday.
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