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The lunar ranging measurements now being made at the McDonald Observatory have an accuracy of 1 nsec in round-trip travel time. This corresponds to 15 cm in the one-way distance. The use of lasers… (More)
In a recent letter Hunt  described a microwave transponder that can be landed on the moon and that can be used, in conjunction with a modified Glotrac station, to measure the distance between… (More)
An analysis of six years of lunar-laser-ranging data gives a zero amplitude for the Nordtvedt term in the earth-moon distance yielding the Nordtvedt parameter eta = 0.00 plus or minus 0.03. Thus,… (More)
Acquisition measurements of the round-trip travel time of light, from the McDonald Observatory to the Laser Ranging Retro-Reflector deployed on the moon by the Apollo 11 astronauts, were made on 20… (More)
Measurements of the range to the Beacon Explorer C spacecraft from a single laser tracking system at Goddard Space Flight Center have been used to determine the change in latitude of the station… (More)
On May 12, 13, and 14, 1959, the Thirteenth Annual Frequency Control Symposium sponsored by the Frequency Control Division of the US Army Signal Research and Development Laboratory was held at Asbury… (More)