The basics of the lunar orbit rendezvous ( LOR ) concept had been expressed as early as 1916 by Yuri Kondratyuk and 1923 by German rocket pioneer Hermann Oberth .
NASA would provide the first practical application of the concept .
Although the basics of the lunar orbit rendezvous ( LOR ) concept had been expressed as early as 1916 by Yuri Kondratyuk and 1923 by German rocket pioneer Hermann Oberth , NASA would provide the first practical application of the concept .