Re: [LEAPSECS] Leap seconds have a larger context than POSIX

2020-02-05 Thread Steve Allen
In the late 1960s German radio station DCF77 did not broadcast time signals 24 hours a day. Different agencies controlled different signals at different times of day. Deutsches Hydrographisches Institut broadcast signals based on old UTC using their measurements of UT2 and the BIH offsets. PTB b

Re: [LEAPSECS] Leap seconds have a larger context than POSIX

2020-02-05 Thread Steve Allen
On Wed 2020-02-05T15:32:54-0800 Tom Van Baak hath writ: > I'm not sure it's fundamental to TAI that one must always, or only, use > 24x60x60 radix notation. That's a useful convention in many cases, but at > the h/w counter or s/w binary integer level radix notation is not required. There were dis

Re: [LEAPSECS] Leap seconds have a larger context than POSIX

2020-02-05 Thread Tom Van Baak
Warner, > Yes. I wish it were clearer that TAI time is a regular radio expression of time. > Here regular radix means that it every day has 24 hours and every hour 60 minutes > and every minute has 60 seconds. I'm not sure it's fundamental to TAI that one must always, or only, use 24x60x60 r

Re: [LEAPSECS] Leap seconds have a larger context than POSIX

2020-02-05 Thread Michael Deckers via LEAPSECS
   On 2020-02-04 21:16, Steve Allen wrote: The first time that the 4th meeting of the CCDS happened was in 1966, but that meeting is not found in any official record. The meeting ended with a vote to recommend that the CGPM should adopt an SI second based on cesium, but the circumstances of t

Re: [LEAPSECS] Leap seconds have a larger context than POSIX

2020-02-05 Thread Warner Losh
On Tue, Feb 4, 2020 at 7:31 AM Brooks Harris wrote: > On 2020-02-04 2:54 AM, Warner Losh wrote: > > > > Have I forgotten any of the other details of leap seconds that are > > more tribal knowledge than rigorously specified? > > > > Warner > > > > > I think another unclear topic is when the value