Example image of eyePlorer eyePlorer map for '1840': Gregorian calendar Julian calendar Leap year starting on Monday Leap year starting on Wednesday Roman numerals Herald Sun January 3 Melbourne January 10 January 13 Long Island Steamship Lexington Antarctica Charles Wilkes January 19 United States Wilkes Land Adélie Land Jules Dumont d'Urville January 22 New Zealand United Kingdom Wellington February Jew Rhodes Rhodes blood libel Blood libel against Jews Damascus Damascus affair February 5 February 6 Treaty of Waitangi Albert, Prince Consort February 10 Victoria of the United Kingdom February 11 Gaetano Donizetti Paris William Hobson Adolphe Thiers France April 15 King's College Hospital May 1 Penny Black Postage stamp May 6 Great Natchez Tornado May 7