Cosmonautics Day (Russian: День Космона́втики, Den Kosmonavtiki) is an anniversary celebrated in Russia and some other former Soviet Union countries on 12 April. In Poland an "International Day of Aviation and Cosmonautics" (Polish: Międzynarodowy Dzień Lotnictwa i Kosmonautyki) is celebrated on the same day. In 2011, at the 65th session of the United Nations General Assembly, 12 April was declared as the International Day of Human Space Flight in dedication of the first crewed space flight made on 12 April 1961 by the 27-year-old Russian Soviet cosmonaut Yuri Gagarin. Gagarin circled the Earth for 1 hour and 48 minutes aboard the Vostok 1 spacecraft.