Mining Project Gutenberg

July 5, 2004 | Games and Diversions, Public Domain Resources | By: Mark VandeWettering

While perusing a random copy of Scientific American from June 18, 1887, I ran across an interesting little nugget of mathematical niftiness: Lewis Carroll’s technique for computing the day of the week for any date in your head. Cool! It’s not quite as simple as the Doomsday algorithm, but then we are talking about Lewis Carroll.