page_title: Buzz Aldrin
section_title: Gemini 12
hierarchical_section_title: Buzz Aldrin / NASA career / Gemini program / Gemini 12
caption_attribution_description: English: Astronaut Edwin E. Aldrin., Jr., pilot of the Gemini 12 spaceflight, performs standup extravehicular activity during the first day of the 4-day mission in space. Command pilot for the Gemini 12 mission, the last in the Gemini series, was astronaut James A. Lovell, Jr. Gemini 12 is docked to the Agena Target Docking Vehicle in background.
context_page_description: Buzz Aldrin is an American engineer, and former astronaut and fighter pilot. Aldrin made three spacewalks as pilot of the 1966 Gemini 12 mission, and as the lunar module pilot on the 1969 Apollo 11 mission, he and mission commander Neil Armstrong were the first two humans to land on the Moon.
  Born in Glen Ridge, New Jersey, Aldrin graduated third in the class of 1951 from the United States Military Academy at West Point, with a degree in mechanical engineering. He was commissioned into the United States Air Force, and served as a jet fighter pilot during the Korean War. He flew 66 combat missions and shot down two MiG-15 aircraft.
  After earning a Sc.D. degree in astronautics from the Massachusetts Institute of Technology, Aldrin was selected as a member of NASA's Astronaut Group 3, making him the first astronaut with a doctoral degree. His doctoral thesis was Line-of-Sight Guidance Techniques for Manned Orbital Rendezvous, earning him the nickname "Dr. Rendezvous" from fellow astronauts. His first space flight was in 1966 on Gemini 12 during which he spent over five hours on extravehicular activity.
context_section_description: Initially, Gemini 12's mission objectives were uncertain. As the last scheduled mission, it was primarily intended to complete tasks that had not been successfully or fully carried out on earlier missions. While NASA had successfully performed rendezvous during Project Gemini, the gravity-gradient stabilization test on Gemini 11 was unsuccessful. NASA also had concerns about extravehicular activity (EVA). Cernan on Gemini 9 and Richard Gordon on Gemini 11 had suffered from fatigue carrying out tasks during EVA, but Michael Collins had a successful EVA on Gemini 10, which suggested that the order in which he had performed his tasks was an important factor.
  It therefore fell to Aldrin to complete Gemini's EVA goals. NASA formed a committee to give him a better chance of success. It dropped the test of the Air Force's astronaut maneuvering unit (AMU) that had given Gordon trouble on Gemini 11 so Aldrin could focus on EVA. NASA revamped the training program, opting for underwater training over parabolic flight. Aircraft flying a parabolic trajectory had given astronauts an experience of weightlessness in training, but there was a delay between each parabola which gave astronauts several minutes of rest. It also encouraged performing tasks quickly, whereas in space they had to be done slowly and deliberately. Training in a viscous, buoyant fluid gave a better simulation. NASA also placed additional handholds on the capsule, which were increased from nine on Gemini 9 to 44 on Gemini 12, and created workstations where he could anchor his feet.
  Gemini 12's main objectives were to rendezvous with a target vehicle, and fly the spacecraft and target vehicle together using gravity-gradient stabilization, perform docked maneuvers using the Agena propulsion system to change orbit, conduct a tethered stationkeeping exercise and three EVAs, and demonstrate an automatic reentry. Gemini 12 also carried 14 scientific, medical, and technological experiments. It was not a trailblazing mission; rendezvous from above had already been successfully performed by Gemini 9, and the tethered vehicle exercise by Gemini 11. Even gravity-gradient stabilization had been attempted by Gemini 11, albeit unsuccessfully.
  Gemini 12 was launched from Launch Complex 19 at Cape Canaveral on 20:46 UTC on November 11, 1966. The Gemini Agena Target Vehicle had been launched about an hour and a half before. The mission's first major objective was to rendezvous with this target vehicle. As the target and Gemini 12 capsule drew closer together, radar contact between the two deteriorated until it became unusable, forcing the crew to rendezvous manually. Aldrin used a sextant and rendezvous charts he helped create to give Lovell the right information to put the spacecraft in position to dock with the target vehicle. Gemini 12 achieved the fourth docking with an Agena target vehicle.
  The next task was to practice undocking and docking again. On undocking, one of the three latches caught, and Lovell had to use the Gemini's thrusters to free the spacecraft. Aldrin then docked again successfully a few minutes later. The flight plan then called for the Agena main engine to be fired to take the docked spacecraft into a higher orbit, but eight minutes after the Agena had been launched, it had suffered a loss of chamber pressure. The Mission and Flight Directors therefore decided not to risk the main engine. This would be the only mission objective that was not achieved. Instead, the Agena's secondary propulsion system was used to allow the spacecraft to view the solar eclipse of November 12, 1966, over South America, which Lovell and Aldrin photographed through the spacecraft windows.
  Aldrin performed three EVAs. The first was a standup EVA on November 12, in which the spacecraft door was opened and he stood up, but did not leave the spacecraft. The standup EVA mimicked some of the actions he would do during his free-flight EVA, so he could compare the effort expended between the two. It set an EVA record of two hours and twenty minutes. The next day Aldrin performed his free-
caption: Aldrin stands in space while in the Gemini 12 spacecraft, with Earth in the background.
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