Hasan Tahsini, Albanian astronomer, mathematician, and philosopher (d. 1881)
Hoxhë Hasan Tahsini or simply Hoxha Tahsim (7 April 1811 – 3 July 1881) was an Albanian alim, astronomer, mathematician and philosopher. He was the first rector of Istanbul University and one of the founders of the Central Committee for Defending Albanian Rights. Tahsini is regarded as one of the most prominent scholars of the Ottoman Empire of the 19th century.

1811Apr, 7
Hasan Tahsini
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Events on 1811
- 5Mar
Battle of Barrosa
Peninsular War: A French force under the command of Marshal Victor is routed while trying to prevent an Anglo-Spanish-Portuguese army from lifting the Siege of Cádiz in the Battle of Barrosa. - 12Mar
Battle of Redinha
Peninsular War: A day after a successful rearguard action, French Marshal Michel Ney once again successfully delayed the pursuing Anglo-Portuguese force at the Battle of Redinha - 5May
Battle of Fuentes de Oñoro
In the second day of fighting at the Peninsular War Battle of Fuentes de Oñoro the French army, under Marshall André Masséna, drive in the Duke of Wellington's overextended right flank, but French frontal assaults fail to take the town of Fuentes de Oñoro and the Anglo-Portuguese army holds the field at the end of the day. - 16May
Battle of Albuera
Peninsular War: The allies Spain, Portugal and United Kingdom, defeat the French at the Battle of Albuera. - 28Nov
Piano Concerto No. 5 (Beethoven)
Beethoven's Piano Concerto No. 5 in E-flat major, Op. 73, premieres at the Gewandhaus in Leipzig.