Births on January 30

Franz Ritter von Hauer, Austrian geologist and curator (d. 1899)

Franz Ritter von Hauer, or Franz von Hauer (January 30, 1822 – March 20, 1899), was an Austrian geologist.

15 Jan

Demetrios Ypsilantis
Greek War of Independence: Demetrios Ypsilantis is elected president of the legislative assembly.
14 Jun

Difference engine
Charles Babbage proposes a difference engine in a paper to the Royal Astronomical Society entitled "Note on the application of machinery to the computation of astronomical and mathematical tables".
2 Jul

Denmark Vesey
Thirty-five slaves are hanged in South Carolina, including Denmark Vesey, after being accused of organizing a slave rebellion.
26 Jul

Guayaquil Conference
José de San Martín arrives in Guayaquil, Ecuador, to meet with Simón Bolívar.
27 Sep

Rosetta Stone
Jean-François Champollion announces that he has deciphered the Rosetta Stone.