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Luckily, there exists a method, devised by John Conway, to calculate the day of the week of any given day, known as The Doomsday Algorithm. With a little memorization and some practice, you can calculate an answer without needing a phone or an online calendar.
Apr 26, 2020 · Doomsday method: Year code = 0, Century adjustment = 3, so Doomsday was a Wednesday in 1900. Closest Doomsday = Jan. 3 (since 1900 isn’t a leap year), so January 30 (27 = 28 – 1 days later) was a Tuesday.
When advancing a century from a century you know the Doomsday for, go back two days, unless the new century is divisible by 400, in which case only go back one day. Use the anchor day for the century to calculate the doomsday for the year. Century Day: Tuesday = 1600, 2000,...
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John Conway Doomsday Device: John Conway is a legendary mathematician who among his many achievements, devised a simple algorithm for figuring out in your head on what day of the week any calendar date would fall. He called it the Doomsday Rule. He was known to be able to perfo…
Use the simplified Doomsday Algorithm to find the day name of any date this century.
The Doomsday algorithm is a method devised largely by John Conway for mental calculation of the day of the week. There is a key step in this that is…
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How it works. 3 main steps. Century anchor day. Doomsday for that year. Nearest day. Notation. Easier to work with DoWs as numbers. Sunday (0) Monday (1) ... Saturday (6) Century Anchor Day. Remember the 400-year cycle? Two ways to calculate anchor: [1] (5 * (c mod 4)) mod 7 + 2. c = ⌊year/100⌋. • Gives us our starting count.
