[LEAPSECS] BBC radio Crowd Science

[Stephen Scott]

On 2017-02-03 16:30, Warner Losh wrote:
> On Wed, Feb 1, 2017 at 11:14 PM, Warner Losh <imp at bsdimp.com> wrote:
>> On Wed, Feb 1, 2017 at 10:37 PM, Zefram <zefram at fysh.org> wrote:
>>> Warner Losh wrote:
>>>> If you are going to willfully misunderstand, then I'm done being patient.
>>> I am not willfully misunderstanding.  I have tried to understand
>>> what you're doing, and I've been unable to find a system that works
>>> consistently, uses the labelling of leap seconds on which we are agreed,
>>> and yields TAI-UTC changing at the start of a positive leap second.
>>> Please enlighten me.  If you were to supply the couple of worked examples
>>> that I have suggested, I believe that would shed much light on your
>>> system.
>> I've already done exactly that. I'll see if I have time tomorrow to
>> write it up again using TeX or something that's easier to format and
>> explain with than ASCII text. Based on Tom's description of my method,
>> I think he may misunderstand it too. It's as consistent as the
>> calendar system we have today.
> I'm doing a longer write up, but work got crazy...
>
> But consider TAI and UTC when they were equal, for the sake of
> argument.
They were defined as being equal at 1958-01-01T00:00:00Z (UTC)
> I know they never were, but if we look at what the first one
> would look like:
>
> TAI                                      UTC                         delta
> 23:59:58                             23:59:58                    0
> 23:59:59                             23:59:59                    0
> 00:00:00                             23:59:60                    1
> (since how can it be 0 if they are different?)
> 00:00:01                             00:00:00                    1
>
> So either there's some weird math that lets one subtract two numbers
> that are different and get 0 as the answer, or the delta has to change
> at the start.
>
> It's understanding what the weird math is that I'm having trouble with
> for people that say it is after the leap second that the delta
> changes.
Standards are typically written in plain text. Its the normative prose 
that counts.
Considering the prior comments about TF.460-1 and the IERS Bulletin C I 
have problems with the delta changing any place other than after the 
change, a point where the count rolls over to zero.
The math should be executed to conform to the published standards and 
documentation.

-Stephen Scott
>
> Warner
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