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Zeller's congruence is an algorithm devised by Christian Zeller in the 19th century to calculate the day of the week for any Julian or Gregorian calendar date. It can be considered to be based on the conversion between Julian day and the calendar date.
The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.
To find which day of the week Christmas Day of 2021 is, proceed as follows: in the year 2021, doomsday is on Sunday. Since December 12 is a doomsday, December 25, being thirteen days afterwards (two weeks less a day), fell on a Saturday. Christmas Day is always the day of the week before doomsday.
Thurston 1909 continues: . Now, as a moment's reflection shows, if 1 January is a Sunday, all the days marked by A will also be Sundays; if 1 January is a Saturday, Sunday will fall on 2 January, which is a B, and all the other days marked B will be Sundays; if 1 January is a Monday, then Sunday will not come until 7 January, a G, and all the days marked G will be Sundays ...
Companies in Europe often use year, week number, and day for planning purposes. So, for example, an event in a project can happen on w43 (week 43) or w43-1 (Monday, week 43) or, if the year needs to be indicated, on w0643 (the year 2006, week 43; i.e., Monday 23 October–Sunday 29 October 2006). An ISO week-numbering year has 52 or 53 full ...
St. Patrick's Day: Sunday, March 17 NYC Pride Parade: Sunday, June 30 This article originally appeared on NorthJersey.com: Holidays 2024: Here are the special days and dates
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Special pages; Permanent link; ... July 9 in recent years ... July 9 is the 190th day of the year (191st in leap years) ...