Yuri Vasilievich Kondratyuk (real name Aleksandr Ignatyevich Shargei, Russian: Алекса́ндр Игна́тьевич Шарге́й, Ukrainian: Олександр Гнатович Шаргей) (21 June 1897 – February 1942) was a Soviet engineer and mathematician. He was a pioneer of astronautics and spaceflight, a theoretician and a visionary who, in the early 20th century, developed the first known lunar orbit rendezvous (LOR), a key concept for landing and return spaceflight from Earth to the Moon.[1][2] The LOR was later used for the plotting of the first actual human spaceflight to the Moon. Many other aspects of spaceflight and space exploration are covered in his works.
Kondratyuk made his scientific discoveries in circumstances of war, repetitious persecutions from authorities and serious illnesses.
“Yuriy Kondratyuk” is a stolen identity under which the author was hiding after the Russian revolution and became known to the scientific community.
The Conquest of Interplanetary Spaces is a science book by Soviet engineer and mathematician Yuri Kondratyuk published in 1929, significant for being one of the first documented proposals for lunar orbit rendezvous.
The Conquest of Interplanetary Space was published in Novosibirsk. Yuri Kondratyuk paid the Siberian Union Printing Shop. It issued 2,000 copies of the book[1].
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