[LEAPSECS] Civil timekeeping before 1 January 1972

Tom Van Baak tvb at LeapSecond.com
Tue May 5 20:50:50 EDT 2015

> The tabulations of the times of emission of radio broadcasts of UTC
> were given in units of, and with an accuracy of 0.0001 s; i.e., 100
> microseconds.
> The tabulations of the intercomparisons between the time scales in
> those laboratories are given with decimals to 0.1 microsecond, or 100
> nanoseconds.
>> I don't believe 3 ns is significant for any time stamp from that
>> era.

Steve and Paul,

To further add perspective to 1960's timescales, read these wonderful papers:

Correlating Time from Europe to Asia with Flying Clocks

World-Wide Time Synchronization, 1966

'Flying Clock' Comparisons Extended to East Europe, Africa and Australia

The articles should give you a better feel for what timekeeping, clocks, and timescales are. Does your C# code incorporate the notion of error bars? If your users are scientific, perhaps they need to know how uncertain timescale conversions are.


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