Cosmonautics Day is a holiday celebrated in Russia on April 12. This holiday celebrates the first manned space flight performed on April 12, 1961 by Soviet cosmonaut Yuri Gagarin.
The holiday was established in the Soviet Union one year later, on April 9, 1962 by the Special Decree of the Presidium of the Supreme Soviet of the USSR.
The Supreme Soviet of the Soviet Union was the highest legislative body in the Soviet Union and the only one with the power to pass constitutional amendments. It elected the Presidium, formed the Council of Ministers, the Supreme Court, and appointed the Procurator General of the USSR.
In modern Russia, it is celebrated in accordance with the Russian Federal Law of March 13, 1995 "On the Days of Military Glory and the Commemorative Dates in Russia" approved by Russian State Duma, the lower house of the Federal Assembly of Russia (legislature), (Russian Parliament).
It is necessary to remark that it is not a day-off in Russia. It was not a day-off in USSR either.