[tz] [PROPOSED 2/3] Simplify leapadd

Michael H Deckers michael.h.deckers at googlemail.com
Wed Jan 15 11:28:35 UTC 2020

    On 2020-01-15 03:04, Steve Allen wrote:

> The reasons why Study Group VII recommended a text allowing multiple
> seconds are not evident, and neither are the reasons why Document
> VII/1008 was amended on the floor during the Plenary Assembly, but
> what the CCIR un-did in 1970 could still be re-done by ITU-R or a
> sucessor agency.

     Isn't that obvious? If UTC cannot deviate from UT1 by more than 0.7 s
     (as Recommendation 460 originally stipulated) then UTC cannot
     have leaps by more than 1.4 s. Leaps by N s are only possible when
     |UTC - UT1| is allowed to be >= N/2 s.

     The draft version of Study Group VII (the one that allows for leaps
     in UTC by an integral number of seconds) specifies no bound
     for |UTC - UT1|.

     Michael Deckers.

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