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The Doomsday Algorithm - Numberphile
Conway's Doomsday Algorithm
How to Figure Out the Day of the Week For Any Date Ever
John H. Conway - Doomsday, part 1
Complete method: how to find the week-day for any date?
The Lightning Algorithm - Numberphile
Doomsday Algorithm at GRCC
BECOME A HUMAN CALENDAR in 15 MINUTES (calculate ANY day of ANY year)