Steve Allen sla at ucolick.org
Fri Mar 6 23:57:17 EST 2015

On Fri 2015-03-06T21:37:42 -0700, Warner Losh hath writ:
> So it isn't outside the realm of possibilities that you'd have people making measurements
> from the late 60's till 1972 using UTC (and yes, it did exist in a practical form
> before 1972, just not in the current form and the common usage often leaves some
> ambiguity between the actual, realized form as broadcast by WWV, or the proleptic
> form w/o leap seconds). Actual measurements from this time, though, were based
> on something approaching the UTC as broadcast by WWV. Not sure how many data
> sets from that time survive until today, and how many need to be converted from that
> to UT1 or UT2, but evidentially there's some...

Yes and yes, but these are specialty applications for specialty datasets
which can only be reduced to a precise modern time scale if the original
observations and equipment were meticulously calibrated.
And then they must be reduced by going back to look at, e.g.
Please don't try to make this part of a General Timestamp API.

Before 1972, for a general API, there is just UT.

Steve Allen                 <sla at ucolick.org>                WGS-84 (GPS)
UCO/Lick Observatory--ISB   Natural Sciences II, Room 165    Lat  +36.99855
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