Re: [LEAPSECS] McCarthy point (was: Fixing POSIX time)

From: Poul-Henning Kamp <phk_at_PHK.FREEBSD.DK>
Date: Thu, 19 Jan 2006 21:58:09 +0100

In message <>, Markus Kuhn writes:

>All I wanted to say is that for a good choice of epoch, it would be nice
>if we agreed on it not only to within a few seconds (the leap-second
>problem), but also to within a few milli- or microseconds (the SI/TAI
>second problem). The latter seems much easier to do for 2000 than for
>1972 or even 1958. In applications such as observing planetary motion
>over many years, the difference matters.

Good point.

Presumably, the epoch will be defined relative to TAI or UTC to get
maximum precision, so the limiting factor will probably be measuring
(or having had measured) UT1 with maximum precision at the epoch.


Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk_at_FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
Received on Thu Jan 19 2006 - 13:08:29 PST

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