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providing the Apollo spacecraft with a free-return trajectory, one that would allow it to coast around the Moon and safely return to Earth without requiring any engine firings should a problem arise on the way to the Moon; with good visibility during the landing approach, meaning the Sun would be between 7 and 20 degrees behind the LM; and
The other crew members use the same call sign with a number of their rank in the chain of command suffixed. Russian popular journalism refers to the crew by the plural of the call sign (for example, "the Fotons"). Kedr, meaning "cedar," was the call sign of Yuri Gagarin, the first man in space. It would have disclosed nothing to a listener ...
The 1995 film Apollo 13 used the slight misquotation "Houston, we have a problem", which had become the popularly expected phrase, in its dramatization of the mission. [1] The phrase has been informally used to describe the emergence of an unforeseen problem, often with a sense of ironic understatement. [3] [4]
The geometric center of the Earth, i.e. the arithmetic mean position of all points within the oblate spheroid that is the precise shape of the Earth. geocentric With reference to, or pertaining to, the geometric center of the Earth; [14] centered upon the Earth, e.g. a geocentric orbit. geocentric zenith
Apollo 16 landed in the Descartes Highlands on April 20, 1972. The crew was commanded by John Young, with Ken Mattingly and Charles Duke. Young and Duke spent just under three days on the surface, with a total of over 20 hours EVA. [121] Apollo 17 was the last of the Apollo program, landing in the Taurus–Littrow region in
Most lunar low orbits below 100 km (60 mi) are unstable. [2]Lunar Module Eagle in lunar orbit during Apollo 11, July 1969. Gravitational anomalies slightly distorting the orbits of some Lunar Orbiters led to the discovery of mass concentrations (dubbed mascons) beneath the lunar surface caused by large impacting bodies at some remote time in the past.
This is an accepted version of this page This is the latest accepted revision, reviewed on 23 January 2025. Second crewed Moon landing Apollo 12 Commander Pete Conrad studies the Surveyor 3 spacecraft, which had landed two years previously; the Apollo Lunar Module, Intrepid, can be seen at top right. Mission type Crewed lunar landing (H) Operator NASA COSPAR ID CSM: 1969-099A LM: 1969-099C ...
On the landing, a combination of thrust from residual pressure in the docking tunnel that connected the Lunar Module with the command module Columbia in orbit, and an imperfect understanding of the Moon's uneven gravitational field, resulted in navigation errors which pushed the powered descent initiation point about 3 miles (4.8 km), and thus ...