Fait mathématique: 1504 is the number of anisohedral 21-iamonds.
Culture générale: 1504 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: February 12th is the day in 1689 that the Convention Parliament declares that the flight to France in 1688 by James II, the last Roman Catholic British monarch, constitutes an abdication.