Charles Redmond. National Aeronautics and Space Administration lyndon B. JohMon Spece Cent. Houston, Texas 77058 AC713 483-5111 Charles Redmond RELEASE NO: 77-47. September 12, 1977. p 5. "...Even though the experiments will be terminated, the transmitters will continue to serve Earth as a reference point in astronomy. The Jet Propulsion Laboratory will continue to use the signals from the ALSEP transmitters to assist in the Lab's deep space work including geodetic and astrometric studies and spacecraft navigation. Also, the motion of the lunar orbit will be accurately monitored against a background of extra-galactic stars to test gravitational theories". Archived
Charles Redmond. National Aeronautics and Space Administration lyndon B. JohMon Spece Cent. Houston, Texas 77058 AC713 483-5111 Charles Redmond RELEASE NO: 77-47. September 12, 1977. p 5. "...Even though the experiments will be terminated, the transmitters will continue to serve Earth as a reference point in astronomy. The Jet Propulsion Laboratory will continue to use the signals from the ALSEP transmitters to assist in the Lab's deep space work including geodetic and astrometric studies and spacecraft navigation. Also, the motion of the lunar orbit will be accurately monitored against a background of extra-galactic stars to test gravitational theories". Archived