Template:Selected anniversaries/December 31
1610: Mathematician and fencer Ludolph van Ceulen dies. He spent a major part of his life calculating the numerical value of the mathematical constant π.
1853: Banquet held in the mould of the Crystal Palace Iguanodon.
1854: Vandal Savage uses solar eclipse to defeat his enemies.
1894: Mathematician Thomas Joannes Stieltjes dies. He worked on almost all branches of analysis, continued fractions and number theory, and was called "the father of the analytic theory of continued fractions."
1969: Brion Gysin uses hand-held scrying engine to detect and expose Extract of Radium marketing campaign.
1973: New class of Crimes against mathematical constants "feel worse than they actually are" on New Year's Eve.
2016: Extract of Radium wishes you a Happy New Year!