What day of the week was October 23, 2011?

The day of the week October 23rd, 2011 fell on was a Sunday.

Herbert A. Hauptman the American mathematician, Nobel Prize laureate (b. 1917) died on this day in 2011. As did John McCarthy the American computer scientist, developed the Lisp programming language (b. 1927) , Marco Simoncelli the Italian motorcycle racer (b. 1987) .

A powerful 7.2 magnitude earthquake strikes Van Province the Turkey, killing 582 people and injuring thousands. The Libyan National Transition Council deems the Libyan civil war over.