Re: [LEAPSECS] Risks of change to UTC

From: M. Warner Losh <imp_at_BSDIMP.COM>
Date: Fri, 20 Jan 2006 22:13:51 -0700 (MST)

In message: <43D1650B.1000301_at_usa.net>
            James Maynard <james.h.maynard_at_USA.NET> writes:
: M. Warner Losh wrote:
: > In message: <43D15F4C.5_at_usa.net>
: > James Maynard <james.h.maynard_at_USA.NET> writes:
: > : ones position using sight reduction tables. Today a mechanical watch or
: > : chronometer, or a battery-powered wristwatch, can be set to UTC using
: > : radio time signals. Then when power fails, the sailor still has a
: > : reasonably accurate spprodximation to UT1 available.
: >
: > If DUT1 is broadcast, then one can set the time keeping device to UT1
: > by a means similar to setting it to UTC, even if DUT1 exceeds 0.9s
: > with a similar accuacy (or better). There's nothing that says a watch
: > has to display UTC to be set correctly.
: >
: > Warner
: >
: > .
: >
: And how is DUT1 to be broadcast in a language-independent manner? That
: protocol needs to be established well in advance.

It already is being broadcast in, eg, WWV.

Warner
Received on Fri Jan 20 2006 - 21:15:55 PST