[time-nuts] time sync by moonbounce

[ew]

This is a must read. Could not put it down, JPL, NASA,  Eisenhowe,r did learn a lot at the same time fascinating
Bert Kehren
In a message dated 5/22/2020 10:36:53 PM Eastern Standard Time, jimlux at earthlink.net writes:

Apparently, they used moonbounce between DSN stations to synchronize to 5 microseconds in 1968. It was easier and cheaper than flying cesium clocks around. (And the Rb standards weren't good enough).
https://ntrs.nasa.gov/search.jsp?R=19770007245
History of DSN - mostly about politics, history, transmitters and receivers, but a whole section on timekeeping, phase measurements, etc. starting around page 133 (The DSN Inherent accuracy project), and the discovery during Mariner that UTC and UTI were different enough to cause nav errors.
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