... for January 27th. Sorry for the email spam, I'm done after this!
On this day in 1967, the Outer Space Treaty opened for signatures. https://en.wikipedia.org/wiki/Outer_Space_Treaty
On this day in 1736, the last king of Poland abdicated the throne. https://en.wikipedia.org/wiki/Stanis%C5%82aw_Leszczy%C5%84ski