January 12 Royal Astronomical Society founded in England January 30 Edward Bransfield aboard Williams discovers Antarctica (UK claim) February 6 1st organized emigration of blacks back to Africa (New York to Sierra Leone) February 6 U.S. population announced at 9,638,453 (1,771,656 blacks (18.4%)) February 23 Cato Street conspiracy uncovered March 3 Missouri Compromise passes, allowing slavery in Missouri March 5 Dutch city of Leeuwarden forbids Jews to go to synagogues on Sundays March 9 James Monroe's daughter Maria marries in the White House March 9 Philippines chases out foreigners; about 125 die March 15 Maine admitted as 23rd state March 25 Greece freedom revolt against anti Ottoman attack May 13 Opera "Die Jagarsbraut" is completed June 28 Tomato is proven non-poisonous July 1 1st edition of newspaper "Courrier de la Meuse" published" August 7 1st potatoes planted in Hawaii August 14 1st U.S. eye hospital, the New York Eye Infirmary, opens in New York City October 9 Guayaquil, Ecuador declares its freedom from Ecuador October 20 Spain sells part of Florida to U.S. for $5 million November 3 Cuenca Ecuador declares independence November 7 James Monroe elected 5th U.S. president November 17 Antarctica discovered by Nathaniel B. Palmer on the 'Hero', a 47 foot sloop December 6 U.S. president James Monroe re-elected December 15 1st General pharmacopoeia in U.S. published, Boston December 20 Missouri imposes a $1 bachelor tax on unmarried men between 21 and 50