Space exploration on 16 June 1963. China first launched a person into space 42 years after the launch of "Vostok 1", on 15 October 2003, with the flight of Yang Liwei aboard the "Shenzhou 5" (Divine Vessel 5) spacecraft. The first artificial object to reach another celestial body was Luna 2 in 1959. The first automatic landing on another celestial body was performed by Luna 9 in 1966. Luna 10 became the first artificial satellite of the Moon. The first crewed landing on another celestial body was performed by Apollo 11 on 20 July 1969. The first successful interplanetary flyby was the
Celestial navigation celestial navigation, referred to as the 'altitude-intercept method'. There are several other methods of celestial navigation that will also provide position-finding using sextant observations, such as the noon sight, and the more archaic lunar distance method. Joshua Slocum used the lunar distance method during the first recorded single-handed circumnavigation of the world. Unlike the altitude-intercept method, the noon sight and lunar distance methods do not require accurate knowledge of time. The altitude-intercept method of celestial navigation requires that the observer know exact Greenwich Mean Time (GMT) at the moment of his observation of the celestial body, to the second—since for