Editing Oceanus Procellarum (section)

==Exploration==
The [[robotic spacecraft|robotic]] lunar [[space probe|probes]] [[Luna 9]], [[Luna 13]], [[Surveyor 1]] and [[Surveyor 3]] landed in Oceanus Procellarum. Luna 9 landed southwest of [[Galilaei (lunar crater)|Galilaei]] crater in 1966.  Luna 13 landed southeast of [[Seleucus (crater)|Seleucus]] crater, later in 1966. Surveyor 1 landed north of [[Flamsteed (crater)|Flamsteed]] crater (within the larger Flamsteed P) in 1966, and Surveyor 3 landed in 1967. The [[China|Chinese]] probe [[Chang'e 5]] landed at Statio Tianchuan on [[Mons Rümker]] in Oceanus Procellarum in December 2020 and collected {{convert|1.73|kg|lb|abbr=on}} of lunar rock samples.<ref>{{cite web |last=Jones |first=Andrew |url=https://www.space.com/china-chang-e-5-moon-landing-site-name |title=China's Chang'e 5 moon landing site finally has a name |work=[[Space.com]] |date=8 July 2021 |access-date=9 July 2021}}</ref><ref name="AJ23112020">{{Cite web|url=https://www.cnn.com/2020/12/16/asia/china-lunar-probe-intl/index.html|title=China's Chang'e-5 mission returns to Earth with moon samples|author=Jennifer Hauser and Zamira Rahim|website=CNN|date=16 December 2020 }}</ref>[[File:Apollo 12 landing site 3154 h2.jpg|thumb|176x176px|Image of [[Apollo 12]] landing site (center) used in mission planning (1.75 × 1.75 km)]]During the Apollo program, flight operations planners were concerned about having the optimum lighting conditions at the landing site, hence the alternative target sites moved progressively westward, following the terminator. A delay of two days for weather or equipment reasons would have sent Apollo 11 to [[Sinus Medii]] (designated ALS3) instead of ALS2—[[Mare Tranquillitatis]]; another two-day delay would have resulted in ALS5, a site in Oceanus Procellarum, being targeted.

During the November 1969 [[Apollo 12]] mission, [[astronaut]]s (Charles) [[Pete Conrad]] and [[Alan Bean]] landed the Lunar Module (LM) ''Intrepid'' nearly 165 meters from Surveyor 3 in Oceanus Procellarum.<ref>{{Cite web|title=Apollo 12 Mission Overview|url=https://www.lpi.usra.edu/lunar/missions/apollo/apollo_12/|access-date=2021-04-25|website=www.lpi.usra.edu}}</ref> Their landing site has become known as Statio Cognitum (Latin, "to be known from experience").<ref>{{Cite web|title=Pinpoint Landing on the Ocean of Storms {{!}} Lunar Reconnaissance Orbiter Camera|url=http://lroc.sese.asu.edu/posts/401|access-date=2021-04-25|website=lroc.sese.asu.edu}}</ref>