First launching of a three-stage rocket vehicle consisting of two Nike boosters in tandem and a Deacon rocket as a third stage, and also a first launching of a rocket booster system consisting of three "peelaway" Deacons as the first stage wrapped around a fourth Deacon as a second stage, and a HPAG rocket as a third stage, by NACA Langley's PARD at Wallops Island. References: 17 .
At Redstone Arsenal, all eight H-1 engines of the first stage of the Saturn C-1 launch vehicle were static-fired simultaneously for the first time and achieved 1.3 million pounds of thrust. References: 16 .
Construction was proceeding on schedule at Cape Canaveral, Bermuda, Grand Canary Islands, the Woomera and Muchea Australian sites, and at the demonstration site on Wallops Island, Virginia. The survey of Guaymas in Western Mexico completed that phase of the program, but the construction was yet to be accomplished. References: 483 .
Milestone achieved in completion of interim or formal agreements concluded for all oversea Mercury tracking stations. References: 17 .
C. Howard Robins, Jr., and others in the MSC Advanced Spacecraft Technology Division investigated the suitability of and formulated a tentative mission flight plan for using a Gemini spacecraft to link up with an orbiting vehicle to achieve a long-duration space mission (dubbed the 'Pecan' mission). The two crewmen were to transfer to the Pecan for the duration of the mission. As with similar investigations for the application of Apollo hardware, the scheme postulated by Robins and his colleagues emphasized maximum use of existing and planned hardware, facilities, and operational techniques.
In response to the Ministry of Defence's guidelines for third generation launch vehicles, the Ministry of General Machine Building issued instructions for Chelomei to study boosters meeting the military's requirements. These included Lox/Kerosene propellants in place of the toxic N2O4/UDMH favoured previously. Chelomei's competitor in the design, Glushko, was then head of NPO Energia which included Glushko's former OKB-456 engine design bureau. Therefore Chelomei was forced to propose using Kuznetsov Lox/Kerosene engines from the cancelled N1 moon program.The use of existing Proton tankage tooling for the stages and the Kuznetsov engines would allow a high-performance vehicle to be developed at minimum cost. However Chelomei was out of favour, Kuznetsov was discredited after the N1 fiasco, and Glushko was ascendant. The proposal stood no chance. Glushko's Zenit launch vehicle became the accepted solution.
Uncertain if Molniya-1T model was Molniya-1 or Molniya-1T. Operation of the long-range telephone and telegraph radiocommunications system in the USSR; transmission of television programmes to stations in the Orbita network. References: 1 , 2 , 5 , 6 .
Second flight test of Yantar-4K1 satellite. Demonstrated full spacecraft design duration of 45 days. High resolution photo reconnaissance; returned film in two small SpK capsules during the mission and with the main capsule at completion of the mission. References: 1 , 2 , 6 , 69 .
Continued repair of Salyut 7 propulsion system fuel lines. References: 66 .
Manned seven crew. Deployed Nusat; carried Spacelab 3. Payloads: Spacelab-3 experiments, habitable Spacelab and mission peculiar experiment support structure. The experiments represented a total of five different disciplines: materials processing in space, environmental observa-tions, life science, astrophysics, and technology experiments. Two getaway specials (GAS). The flight crew was split into gold and silver shifts working 12-hour days during the flight. Additional Details: STS-51-B. References: 1 , 2 , 5 , 6 , 7 , 33 .
Test of new spacesuits. Retrieved and installed external equipment. References: 66 .
Geostationary at 73.0 degrees E.