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Russia celebrates the anniversary of their first human space flight, which took place on April 12 1961. They also pay homage to the first Soviet cosmonaut Yuri Gagarin.
The Russian Space Agency has invited the heads of space agencies and cosmonauts, who took part in space expeditions on Soviet and Russian spacecraft, to attend the anniversary celebration in Moscow on April 12.
Around the world, the date is celebrated as Yuri's Night with parties.