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{{Infobox settlement
| name = Tranquility Base
| official_name = Statio Tranquillitatis
| image_skyline = Aldrin Looks Back at Tranquility Base - GPN-2000-001102.jpg
| image =
| image_alt =
| image_caption = Astronaut Buzz Aldrin with scientific equipment, US flag, television camera and Apollo Lunar Module at Tranquility Base. Photo by Neil Armstrong
| image_seal =
| seal_alt =
| nickname =
| image_map = Apollo 11 photo map.pdf
| map_alt =
| map_caption = Map of Tranquility Base exploration
| image_map1 = Apollo-11-landing-site.png
| map_caption1 = Location of Tranquility Base (Apollo 11 landing site)
| coordinates = {{coord|00|41|15|N|23|26|00|E|globe:moon|format=dms|display=inline,title}}
| coordinates_footnotes = | total_type = | unit_pref = Imperial| dimensions_footnotes = | length_km =| length_mi =| width_km =| width_mi =| elevation_footnotes = | elevation_m =| elevation_ft =| footnotes =}}Tranquility Base (Latin: Statio Tranquillitatis) is the site on the Moon where, in 1969, humans landed and walked on another celestial body for the first time. On July 20, 1969, Apollo 11 crewmembers Neil Armstrong and Buzz Aldrin landed their Apollo Lunar Module Eagle at approximately 20:17:40 UTC. Six hours later, the two astronauts exited the spacecraft and spent 2 hours 31 minutes on the lunar surface, examining and photographing it, setting up some scientific experiment packages, and collecting {{convert|47.5|lb|kg}} of dirt and rock samples for return to Earth. They lifted off the surface on July 21 at 17:54 UTC. Tranquility Base has remained unvisited since then.Its lunar coordinates are 00°41′15″N, 23°26′00″E, in the south-western corner of the lunar lava-plain called Mare Tranquillitatis ("Sea of Tranquility"), east of the craters Sabine and Ritter, north of the crater Moltke, and near a rille called Rimae Hypatia, but unofficially called "U.S. 1".[{{cite |title=The Eagle Has Landed – 1969; Video Transcript for Archival Research Catalog (ARC) Identifier 45017 |year=1969 |access-date=Nov 27, 2015 |publisher=National Archives and Records Administration |url=https://www.archives.gov/files/social-media/transcripts/transcript-eagle-has-landed-1969-45017.pdf}}]
2. ^{{cite press release | title = Apollo 11 Lunar Landing Mission Press Kit | publisher = NASA | date = July 6, 1969 | pages = 82–85 | url = https://history.nasa.gov/alsj/a11/A11_PressKit.pdf }}
3. ^{{Cite book |author=Chaikin, Andrew |title=A Man on the Moon: The Triumphant Story Of The Apollo Space Program |date=2007|publisher=Penguin Group |location=New York |page=88|isbn=978-0-14-311235-8}}
4. ^{{cite web| url=http://www.history.nasa.gov/alsj/a11/a11.landing.html |last=Jones | first=Eric M.| title=The First Lunar Landing, time 102:36:21}}
5. ^{{cite web| url=http://www.history.nasa.gov/alsj/a11/a11.postland.html |last=Jones | first=Eric M.| title=Post-landing Activities , time 102:55:16}}
6. ^{{cite web|url=http://www.hq.nasa.gov/alsj/a11/a11.landing.html|title=Apollo 11 Lunar Surface Journal: The First Lunar Landing|last=Jones|first=Eric M.|work=NASA|date=1995|accessdate=2009-07-15}}
7. ^Failure is Not an Option. History, 24 August 2003.
8. ^{{Cite book |author=Chaikin, Andrew |title=A Man on the Moon: The Triumphant Story Of The Apollo Space Program |date=2007|publisher=Penguin Group |location=New York |page=637|isbn=978-0-14-311235-8}} Author's note on page 206.
9. ^{{cite news|last=Moskowitz|first=Clara|publisher=Space.com|title=Apollo Moon Landing Flags Still Standing, Photos Reveal|url=http://www.space.com/16798-american-flags-moon-apollo-photos.html|accessdate=2015-07-21}}
10. ^{{cite web|title=NASA Looks to Protect Historic Sites on the Moon|url=http://www.smithsonianmag.com/science-nature/nasa-looks-to-protect-historic-sites-on-the-moon-47186092/|publisher=Smithsonian magazine|author=Michael Milstein|accessdate=22 July 2013}}
11. ^1 2 {{cite news|last=Chang|first=Kenneth|title=To Preserve History on the Moon, Visitors Are Asked to Tread Lightly|url=https://www.nytimes.com/2012/01/10/science/space/a-push-for-historic-preservation-on-the-moon.html|newspaper=The New York Times|date=January 10, 2012|accessdate=January 11, 2012}}
External links- Surface panorama of landing site (by Armstrong), Lunar and Planetary Institute
- USGS Planetary Gazetteer Entry
- Photo Number IV-085-H1, Digital Lunar Orbiter Photographic Atlas of the Moon, showing the Apollo 11 landing site and vicinity
{{Apollo landing sites}}{{Authority control}} 4 : Apollo 11|Exploration of the Moon|LQ12 quadrangle|Geological type localities |