1827 (one thousand eight hundred twenty-seventh) year according to the Gregorian calendar - a common year, starting on Monday. This is 1827 AD, 827 of the 2nd millennium, 27th year of the 19th century, 7th year of the 3rd decade of the 19th century, 8th year of the 1820s.
Karl Baedecker, a German publisher, founded a publishing house of travel guides for various countries in Koblenz.
A fire breaks out in the city of Turku (Finland), after which the city is rebuilt.
May 1 - an unsuccessful attempt to lift the siege of the capital of Honduras, Comayagua, besieged by the federal army. The remnants of the troops of opponents of Federation President Arce went to Nicaragua.
May 4 - In Athens, during the storming of the Acropolis, the commander-in-chief of the troops of continental Greece, Georgios Karaiskakis, was killed.
September 27 - the publication in Russia of the Highest approved Charter of the Cabinet of His Imperial Majesty.
October 20 - the Battle of Navarino took place.
November 11 - Francisco Morazán's army defeats the federal forces of the United Provinces of Central America in the Battle of the Trinidad Valley. The next day Morasan entered Tegucigalpa.
November 26 - the army of Francisco Morazán entered the capital of Honduras, the city of Comayagua. Morasan became the ruler of the country.
Hungarian physicist and electrical engineer Anjos Istvan Jedlik built the world's first dynamo.
Creation of a special corps of gendarmes.
The first public opinion survey prepared by the III Branch of His Imperial Majesty's Own Chancellery took place.
In Russia, special ranks were established for military ranks of the IV class - the retinues of His Majesty the Major General and the retinues of His Majesty the Rear Admiral (their first awards took place in 1829).
See also: Category: Born in 1827
January 13 - Nikolai Beketov, one of the founders of physical chemistry and chemical dynamics, laid the foundations for the principle of aluminothermy (died in 1911).
January 14 - Pyotr Petrovich Semyonov-Tyan-Shansky, Russian geographer, botanist, statistician and public figure.
January 17 - Meroslawski, Ludwik, Polish general, dictator of the 1863 uprising (died in 1878).
January 23 - Saigo Takamori, one of the most influential samurai in Japanese history.