Testifying before the Senate Space Committee, James E. Webb, the NASA Administrator, said: 'There will be no further Mercury shots . . .' He felt that the manned space flight energies and personnel should focus on the Gemini and Apollo programs. Thus, after a period of 4 years, 8 months, and 1 week, Project Mercury, America's first manned space flight program, came to a close. References: 483 .
D. Brainerd-Holmes announced his resignation as NASA's Deputy Associate Administrator and Director of Manned Space Flight, effective sometime in the fall. He had joined NASA in 1961 and was returning to industry. References: 16 .
The Mission Analysis Branch (MAB) of MSC's Flight Operations Division studied the phenomenon of a spacecraft's "skip" when reentering the earth's atmosphere from lunar trajectories and how that skip relates to landing accuracies. Additional Details: Skip lunar reentry trajectories studied for Apollo. References: 16 .
Venera 4 was successfully launched towards the planet Venus with the announced mission of direct atmospheric studies. On October 18, 1967, the descent vehicle entered the Venusian atmosphere. Signals were returned by the spacecraft, which deployed a parachute after braking to subsonic velocity in the Venusian atmosphere, until it reached an altitude of 24.96 km. References: 1 , 2 , 5 , 6 , 64 , 296 .
Environmental research. The experiments selected for Nimbus-6 were the earth radiation budget (ERB), electrically scanning microwave radiometer (ESMR), high-resolution infrared radiation sounder (HIRS), limb radiance inversion radiometer (LRIR), pressure modulated radiometer (PMR), scanning microwave spectrometer (SCAMS), temperature-humidity infrared radiometer (THIR), tracking and data relay experiment (T+DRE), and the tropical wind energy conversion and reference level experiment (TWERLE). This complement of advanced sensors was capable of mapping tropospheric temperature, water vapor abundance, and cloud water content; providing vertical profiles of temperature, ozone, and water vapor; transmitting real-time data to a geostationary spacecraft (ATS 6); and yielding data on the earth's radiation budget. References: 1 , 2 , 5 , 6 .
Fifth static firing, MPTA-098, NSTL, flight nozzles (54 seconds, early cutoff, accelerometer filters) References: 15 .
Zenit-2M area survey photo reconnaissance satellite used for earth resources studies as part of 'Gektor-Priroda' project. Investigation of the natural resources of the earth in the interests of various branches of the national economy of the USSR and international cooperation. References: 1 , 2 , 6 , 103 .
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: 279 .
Began solar array installation. References: 66 .
Also performed Indian domestic communications tasks; 83.1 E. Operational multi-purpose satellite for telecommunications, meteorological imaging and data relay, radio and television programme distribution and direct television broadcasting for community reception. Orbital position 83 deg E. Also registered as 1990-5 1A in ST/SG/SER.E/250 by the United States, with category B and orbital parameters 1426.3 min, 35768 x 35811 km x 0.2 deg. References: 1 , 2 , 5 , 6 .