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Doomsday rule
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. This algorithm for mental calculation was devised by John Conway [ 1 ] [ 2 ] after drawing inspiration from Lewis Carroll's work on a perpetual calendar algorithm. [ 3 ] [ 4 ] It takes advantage of the fact that each year has a certain day of the week (the doomsday ) upon which certain easy-to-remember dates fall; for example, 4/4, 6/6, 8/8, 10/10, 12/12, and the last day of February all occur on the same day of the week in any given year. Applying the Doomsday algorithm involves three steps: Determine the "anchor day" for the century.
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Grandmaster Ip Man was born in Foshan (China) in 1893 to a wealthy merchant family and lived to the age of 79, passing away at his home in Hong Kong in December 1972. He began learning Wing Chun sometime after 1906 under Chan Wah-Shun who was said to have been teaching out of the Ip Family Ancestral Temple at the time. Ip Man became Chan Wah-Shun's youngest and last student, as Chan was old and nearing the end of his teaching. Around 1908 Chan suffered a stroke and retired, leaving Ip Man's kung fu instruction to be continued by his senior kung fu brothers such as Ng Jung-So.
