Template:Selected anniversaries/January 20
1573: Astronomer Simon Marius born. He will discover the four largest moons of Jupiter, independently of Galileo Galilei.
1848: Physicist, mathematician, astronomer, inventor, and writer David Brewster invents new class of Gnomon algorithm functions.
1856: Inventor and engineer Wilhelm Bauer incorporates Gnomon algorithm functions into plans for new submarine.
1889: monster appear onstage at Madison Square Garden.
1901: Electrical engineer Zénobe Gramme dies. He co-invented the first usefully powerful electric motor.
1933: Carnivorous dirigibles break their tethers, eat park ranger.
1997: New theory of artificial intelligence accidentally release massive wave of Kingpin inclination.
2016: Advances in dynastic cellular automata theory reveal new members of Bernoulli family.