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The first three lunar missions (Apollo 8, Apollo 10, and Apollo 11) used a free return trajectory, keeping a flight path coplanar with the lunar orbit, which would allow a return to Earth in case the SM engine failed to make lunar orbit insertion. Landing site lighting conditions on later missions dictated a lunar orbital plane change, which ...
Once complete, it obviated the need for the E-type objective of a medium Earth orbital test. The D-type mission was instead performed by Apollo 9; the F-type mission, Apollo 10, flew the CSM/LM spacecraft to the Moon for final testing, without landing. The G-type mission, Apollo 11, performed the first lunar landing, the central goal of the ...
Apollo 1, initially designated AS-204, was planned to be the first crewed mission of the Apollo program, [1] the American undertaking to land the first man on the Moon. It was planned to launch on February 21, 1967, as the first low Earth orbital test of the Apollo command and service module .
While Apollo 11 sparked the interest of the world, the follow-on Apollo missions did not hold the interest of the nation. [222] One possible explanation was the shift in complexity. Landing someone on the Moon was an easy goal to understand; lunar geology was too abstract for the average person.
Apollo 15's LM Falcon as seen by the CSM Endeavour, during rendezvous. The object in the foreground is the EVA floodlight. The LM was placed into a 42 by 9 nm (77.8 by 16.7 km) orbit. Apollo 15 would be the first direct rendezvous, where the two craft would rendezvous within one orbit.
1961 sketch showing 10 C-1 launches required to assemble in Earth orbit an Apollo lunar landing mission. The EOR proposal for Apollo consisted of using a series of small rockets half the size of a Saturn V to put different components of a spacecraft to go to the Moon in orbit around the Earth, then assemble them in orbit.
English: Apollo 17 flight trajectory from liftoff to end of S-IVB first burn. - Altitude is given above Fischer Ellipsoid. E.g. at time 400s: EPO altitude 172km = 6545km geocentric distance = 167km above a spherical Earth of radius 6378.1 km
Orbital photo of the Hadley-Apennine site; Apollo 15 landing site is marked with a circle. Hadley–Apennine is a region on the near side of Earth's Moon that served as the landing site for the American Apollo 15 mission, the fourth crewed landing on the Moon and the first of the "J-missions", in July 1971.