I can not edit the numbers in my initial post, but I can do it here, and with that my proposel still stands: Drop the leap second, and continue UTC without leap seconds, so that 1 mean solar year is defined as the duration of 290091175979732 [31556925,9747x9192631770] periods of radiation in the caesium atom
2014-08-20 16:43 GMT+02:00 Keith Winstein <[email protected]>: > To be a pedant [but if you can't be one on the leapsecs mailing > list...], the SI second is *9192631770* periods of the radiation etc. > Your figure is high by 1000. > > On Wed, Aug 20, 2014 at 9:22 AM, Preben Nørager <[email protected]> > wrote: > > > > In the discussion about whether or not to drop the leap second, I think > it > > is not a question about solar time or not solar time. It is in other > words > > not a question about either solar time or atomic time. > > > > > > > > If we drop the leap second it will be in favour of another timescale, > which > > uses only atomic clocks to tell the time, but the time in that other > > timescale will still be based upon a kind of solar time. > > > > > > > > About a hundred years ago it was decided, that the mean solar year, and > not > > the mean solar day, should be the unit of international time. > > > > > > > > In 1960 the second was defined as 1/31556925,9747 of the mean solar > year, > > and in 1967 the second was redefined [equally in length to the previously > > defined second] as the duration of 9192632770 periods of radiation. > > > > > > > > When the second was defined in 1960 it was defined as a fraction of the > > so-called tropical year. That was a mistake of wording. The tropical > year is > > a measurement of the solar longitude on the ecliptic, but the > international > > definition of the second is not based upon measurement of the solar > > longitude on the ecliptic. > > > > > > > > The definition of the second is based upon Newcomb's theory of the solar > > system, and in that theory it is the barycenter of the solar system, and > not > > the center of the sun, which defines the length of the solar year. > > > > > > > > The length of the solar year, according to Newcomb’s theory, is the time > for > > the longitude of the barycenter of the solar system to increase 360 > decrees. > > > > > > > > The solar year, thus defined, can be measured either for one year, or > for an > > average of years. > > > > > > But the 1960 and the 1967 definition of the second can also be used as an > > international definition of the mean solar year. > > > > > > > > I think we should drop the leap second, and continue UTC without leap > > seconds as TI [International Time], so that 1 mean solar year is the > > duration of 290091231835491000 [31556925,9747x9192632770] periods of > > radiation in the caesium atom. > > > > _______________________________________________ > > LEAPSECS mailing list > > [email protected] > > http://six.pairlist.net/mailman/listinfo/leapsecs > > > _______________________________________________ > LEAPSECS mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/leapsecs >
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