Thank you Michael for pointing this out. I’ve had InsideGNSS correct the on-line version. I would be willing to bet that it will happen in 2035, but I am not privy to any inside information.
> On Mar 20, 2023, at 3:36 PM, Michael Deckers via LEAPSECS > <leapsecs@leapsecond.com> wrote: > > > On 2023-03-20 07:54, Jürgen Appel via LEAPSECS wrote: > > >> In your Conclusion, you say "the CGPM resolution also stipulates that no >> change to current practices can occur before 2035." >> >> This is not how I read read the CGPM document on the BIPM website: >> "The General Conference on Weights and Measures (CGPM), at its 27th meeting >> [...] decides that the maximum value for the difference (UT1-UTC) will be >> increased in, or before, 2035," >> >> So in case the negative leap seconds become a real threat, according to my >> interpretation is is an option to increase the tolerance value earlier than >> 2035 to avoid trying out negative leap seconds a last and first time. >> >> Can someone confirm my view? > > > > You read correctly, the French (official) version has > > ..."décide que la valeur maximale pour la différence > (UT1 - UTC) sera augmentée au plus tard en 2035,".... > > which means "in 2035 at the latest". > > Note also that the definition of UTC as approved by the > CGPM never mentions _any_ explict bound for |UT1 - UTC|; it > only says that (TAI - UTC) is an integral multiple of 1 s > as determined by the IERS. It is the IERS who state that > > "Coordinated Universal Time (UTC) a measure of time > that conforms, within approximately 1 s, to the mean > diurnal motion of the Sun and serves as the basis of > all civil timekeeping." > > quoting the IAU "Nomenclature for Fundamental Astronomy (NFA)" > found at http://syrte.obspm.fr/iauWGnfa/NFA Glossary.html. > > This seems to be lenient enough to allow for not scheduling > a negative leap second even in the case that the difference > (UT1 - UTC) should go a bit below -1 s before 2035. > > Michael Deckers. > > _______________________________________________ > LEAPSECS mailing list > LEAPSECS@leapsecond.com > https://pairlist6.pair.net/mailman/listinfo/leapsecs _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com https://pairlist6.pair.net/mailman/listinfo/leapsecs
