site.btaObservances: April 11

The world:

- International Day of Fascist Concentration Camps Prisoners Liberation;

- World Parkinson's Day.

On this date in Bulgarian history:

1879: Postal communications launched in Bulgaria. Prince Alexander Dondukov-Korsakov endorses Interim Postal Service Rules.

1900: First official football match played in Varna (on the Black Sea).

1964: First trans-Atlantic flight of Bulgarian civil aviation. Ilyushin Il-18 flies basketball teams of Bulgaria, France, Yugoslavia and Czechoslovakia from Sofia to Lima, Peru, for FIBA World Championship.

1989: Bulgarian Communist Party adopts secret decision on massive-scale assimilation of ethnic Turks by forcing them to adopt Slavic names.

1991: Grand National Assembly ratifies UN Convention on the Rights of the Child.