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American astronaut Neil ArmstrongWikipedia, the free encyclopedia
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Yuri Vasilyevich Kondratyuk , real name Aleksandr Ignatyevich Shargei ( Russian : ; Ukrainian : ; 21 June 1897 February 1942 ), was a Soviet engineer and mathematician.
He developed the first known lunar orbit rendezvous (LOR), a key concept for landing and return spaceflight from Earth to the Moon.
LOR was later used for plotting of the first actual human spaceflight to the moon.
Yuri Vasilyevich Kondratyuk was sentenced to three years in a gulag.
Convicted of " anti-Soviet activity", he was sent to a sharashka (research facility prison) rather than a labour camp.
Kondratsi wrote a book on rocket motion and issues concerning the colonization of space.
He also suggested a gravitational slingshot trajectory to accelerate a spacecraft.
Kondratyuk joined the Red Army as a volunteer in June 1941 and died in 1942 near Kaluga .
His unit was involved in heavy fighting against the Nazis in October 1941 .
Neil Armstrong visited the Soviet Union after his historic flight to the Moon to acknowledge his contribution to spaceflight.
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