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Re: [calsify] New Timestamp Draft

Steve Allen <sla@ucolick.org> Thu, 14 January 2021 16:46 UTC

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Date: Thu, 14 Jan 2021 08:46:46 -0800
From: Steve Allen <sla@ucolick.org>
To: Ujjwal Sharma <ryzokuken@igalia.com>
Cc: calsify@ietf.org
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Subject: Re: [calsify] New Timestamp Draft
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On Thu 2021-01-14T08:18:20+0530 Ujjwal Sharma hath writ:
> I'll make a few more changes, release a 01 version, ask for more
> feedback and then let you know, hopefully by the end of this week.

Also note that cesium hyperfine frequency of 9192631770 had
not been measured until 1958, therefore that cannot be the
definition of a second before that year.  That cesium second
was not adopted by the SI until 1967 August.

Before 1970 the only second which was broadly available was the mean
solar second.  The mean solar second was the basis of available civil
time since the 18th century and the official basis of civil time
from 1884 until 1972.

In order to give meaning to civil timestamps before 1972
the document must mention the mean solar second.

--
Steve Allen                    <sla@ucolick.org>              WGS-84 (GPS)
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