Further explanation: http://www.explainxkcd.com/wiki/index.php/1340
"Fantastic," I said. "You did all these measurements?"
"No," Aglie said. "They were done on another kiosk, by a certain Jean-Pierre Adam. But I would assume that all lottery kiosks have more or less the same dimensions. With numbers you can do anything you like. Suppose I have the sacred number 9 and I want to get the number 1314, date of the execution of Jacques de Molay-a date dear to anyone who, like me, professes devotion to the Templar tradition of knighthood. What do I do? I multiply nine by one hundred and forty-six, the fateful day of the destruction of Carthage. How did I arrive at this? I divided thirteen hundred and fourteen by two, by three, et cetera, until I found a satisfying date. I could also have divided thirteen hundred and fourteen by 6.28, the double of 3.14, and I would have got two hundred and nine. That is the year in which Attalus I, king of Pergamon, joined the anti-Macedonian League. You see?"
"Then you don't believe in numerologies of any kind," Dio-tallevi said, disappointed.
http://en.wikipedia.org/wiki/Foucault's_Pendulum
PDF: http://www.cs.utexas.edu/users/acharya/Inputs/Books/Foucault...