Doomsday rule
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 John Conway, inventor of the Doomsday algorithm |
The Doomsday rule or Doomsday algorithm is a way of calculating the day of the week of a given date. It provides a perpetual calendar since the Gregorian calendar moves in cycles of 400 years.
- Related: Ordinal date, Computus, Zeller's congruence, mental calculation
| Encyclopedia of Weekday Calculation by Hans-Christ... Encyclopedia of Weekday Calculation by Hans-Christian Solka, 2010 translate.googleusercontent.com/.../kalender-kopf-gral-p-35993.html&rurl=translate.google.com&twu=1&usg=ALkJrhjGBsfFgwmsN6emA0SwOE9BeTVCGw - Web |
| Doomsday calculator that also "shows all work" Doomsday calculator that also "shows all work" homer.freeshell.org/dd.cgi - Web |
| World records for mentally calculating the day of ... World records for mentally calculating the day of the week in the Gregorian Calendar www.recordholders.org/en/records/dates.html - Web |
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| What is the day of the week, given any date? What is the day of the week, given any date? quasar.as.utexas.edu/BillInfo/doomsday.html - Web |
| Doomsday Algorithm Doomsday Algorithm rudy.ca/doomsday.html - Web |
| Finding the Day of the Week Finding the Day of the Week www.theworldofstuff.com/other/day.html - Web |
