Wikipedia:Selected anniversaries/December 23
December 23: Ziemassvetki in Latvia
- 1823 - A Visit From St. Nicholas, attributed to Clement Clarke Moore, was first published.
- 1947 - The transistor, invented by John Bardeen, Walter Brattain and William Shockley, was first demonstrated at Bell Laboratories.
- 1954 - The first successful human organ transplant: Drs. Joseph Murray and J. Hartwell Harrison transplanted a kidney to a patient from his twin brother.
- 1972 - Pittsburgh Steelers running back Franco Harris made the Immaculate Reception of the football passed "to" him by quarterback Terry Bradshaw near the end of a playoff game.
- 1990 - The Republic of Slovenia voted to secede from the Socialist Federal Republic of Yugoslavia.