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Uncover the place the Eagle might need landed: How you can discover Apollo 11’s backup websites on the moon

July 20, 2025
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Uncover the place the Eagle might need landed: How you can discover Apollo 11’s backup websites on the moon
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On July 20, 1969, Apollo 11 astronaut Neil Armstrong introduced his historic arrival on the traditional lava plain of Mare Tranquillitatis with the next message to NASA: “Houston, Tranquility Base right here, the Eagle has landed.”

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Armstrong’s phrases, spoken less than seven hours earlier than he and fellow NASA astronaut Edwin “Buzz” Aldrin took humanity’s first steps on the floor of one other world, marked a watershed second in human historical past. Nonetheless, the now well-known phrase might simply have been uttered from the other facet of the lunar disk from Tranquility Base.

In February 1968, NASA’s Apollo Site Selection Board revealed 5 potential touchdown websites for Apollo 11 — whittled down from a listing of 30 — together with two that have been on the other facet of the lunar disk from Tranquility base, in Oceanus Procellarum (the Ocean of Storms).


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Every of the 3-by-5-mile (5-by-8-kilometer) touchdown zones have been topic to intensive orbital imaging and have been in the end chosen primarily based on a lot of numerous standards. For instance, every web site needed to be positioned inside 5 levels of the lunar equator so as to expend the least quantity of gas and haven’t any massive hills or deep craters alongside the lander’s method, which might have confused its touchdown radar. Every web site additionally needed to have a slope of lower than 2 levels, with comparatively few craters and glorious lighting throughout the chosen touchdown home windows.

Website 2 within the Sea of Tranquility was ultimately chosen because the prime touchdown web site, whereas two of the remaining shortlisted zones have been designated as contingency touchdown zones to be focused should the launch of Apollo 11’s gigantic Saturn V rocket be delayed.

A man in a spacesuit stands on the moon

“Buzz” Aldrin pictured strolling on the moon throughout the Apollo 11 mission. (Picture credit score: NASA)

Learn on to find the areas of the 5 touchdown zones thought of because the setting for humanity’s first steps on one other world. The overall lunar area containing every web site will be discovered simply with the bare eye throughout the appropriate moon phases, however we have additionally included a extra exact map for these observing the moon via a telescope. A 6-inch scope will permit you to spot the bigger craters wanted to hone in on the areas of the candidate websites. Pleased looking!

Candidate Website 1 —Mare Tranquillitatis (34° East, 2°40″ North)

The primary shortlisted web site for the Apollo 11 touchdown will be discovered on the southern shore of the Sea of Tranquility and is greatest seen because the moon approaches its first quarter moon section, or throughout the full moon, when everything of the lunar floor is lit from the attitude of Earth.

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First, find the darkish expanse of the Sea of Tranquility (Mare Tranquillitatis) positioned barely above the lunar equator within the japanese area of the lunar floor. For those who battle, merely check out the graphic beneath! This lunar function is a gigantic basaltic plain, which fashioned billions of years in the past when lava flows flooded gigantic influence basins, earlier than hardening within the frigid area atmosphere.

The Sea of Tranquility is massive sufficient to be seen simply with the unaided eye. Utilizing a telescope, you too can find the distinguished Maskelyne Crater (proven beneath) and draw an imaginary line east till you hit a brighter patch of terrain jutting up from the south. Apollo 11’s first candidate touchdown zone will be discovered within the patch of lunar mare bordering this outcrop to the east.

A composite image. The left side shows the first quarter moon with the location of the Sea of Tranquility shown in a white circle. The image on the right shows a close up view of the region surrounding the candidate landing site.

Website 1 was positioned to the east of Apollo 11’s historic touchdown web site in Mare Tranquillitatis. (Picture credit score: Picture (left) by Lorenzo Di Cola/NurPhoto by way of Getty Pictures. Picture (proper) by NASA, annotations by Anthony Wooden)

Candidate Website 2 —Tranquility Base (23°37″ East, 0°45″ North)

Tranquility Base, the location of Apollo 11’s historic 1969 touchdown — will be discovered to the southwest of the Sea of Tranquility and, like its predecessor, is greatest seen within the buildup to the primary quarter and full moon phases.

For a better look, first discover the tightly clustered Ritter and Sabine craters on the western fringe of the lunar sea. Subsequent, draw an imaginary line 3 times the width of the Sabine Crater from the decrease fringe of the influence web site resulting in the suitable. This provides you with the approximate location of humanity’s first footprints on one other world.

A composite image. The left side shows the first quarter moon with the location of the Sea of Tranquility shown in a white circle. The image on the right shows a close up view of the region surrounding the candidate landing site close to the Ritter and Sabine craters.

Apollo 11 set down within the Sea of Tranquility near the Ritter and Sabine lunar craters. (Picture credit score: Picture (left) by Lorenzo Di Cola/NurPhoto by way of Getty Pictures. Picture (proper) by NASA, annotations by Anthony Wooden)

Candidate Website 3 —Sinus Medii (1°20″ West, 0°25″ North)

Our third Apollo 11’s touchdown web site candidate is located within the Sinus Medii area smack within the heart of the Earth-facing lunar floor. The area containing the touchdown zone is nearly equidistant between the northern fringe of Ptolemaeus, and the smaller Ukert crater to the north is greatest seen throughout the weeks straddling a full moon.

Sinus Medii would have been the location of the Apollo 11 touchdown had the mission’s Saturn V launch been delayed by simply two days from its historic date of July 16, 1969 to July 18.

Two images, the left being a close up of the whole moon and the right showing specific areas of its surface with labels

The third potential touchdown web site for Apollo 11 was positioned within the Sinus Medii area, above the Ptolemaeus influence crater. (Picture credit score: Picture (left) Picture by Robertus Pudyanto/Getty Pictures. Picture (proper) by NASA, annotations by Anthony Wooden.)

Candidate Websites 4 & 5 —Oceanus Procellarum (36°25″ West, 3°30″ South, 41°40″ West, 1°40″ North)

Oceanus Procellarum performs host to the ultimate two Apollo 11 touchdown zones thought of within the runup to the historic mission, that are greatest seen throughout the moon’s third quarter, or full moon phases. Each will be discovered beneath the intense influence ejecta thrown out within the creation of the Kepler Crater to the north and to the suitable of the Flamsteep P formation.

Had the Apollo 11 Saturn V launch slipped to July 21 1969, then humanity’s first steps on the moon would have been left within the regolith coating Oceanus Procellarum as an alternative. ‘Procellarum Base’ simply would not have the identical ring to it, does it.

Two images side by side, the left looking at the moon from outer space and the right looking at a close up of the moon's surface with several features highlighted

The fourth and fifth potential touchdown websites for Apollo 11 have been positioned in Oceanus Procellarum on the western area of the Earth-facing lunar disk. (Picture credit score: Picture (proper) Yaorusheng by way of Getty. Picture (proper) by NASA, annotations by Anthony Wooden.)

Editor’s Word: For those who seize the location of Apollo 11’s shortlisted touchdown websites and wish to share them with House.com’s readers, then please ship your picture(s), feedback, and your title and placement to spacephotos@area.com.



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