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,
IEEE-UFFC recently posted some videos from IFCS/EFTF 2019, and there's one
by muquans: https://www.youtube.com/watch?v=1eHhdNk50uE
(for me, sound is extremely low in these... need to turn up volume to
almost max)
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