Re: The real problem with leap seconds

2006-01-10 Thread John Cowan
Tim Shepard scripsit: [many sensible opinions snipped] > "leap hours" are a horrible idea, whether they be leap hours inserted > in to some UTC-like global standard, or by local jurisdictions. I understand what's wrong with the former kind, but what's wrong with the latter? Why do you think the

Re: The real problem with leap seconds

2006-01-10 Thread Tim Shepard
> > I still think NTP should have distribute TAI, but I understand using > > Was your failure to form a past-participle a Freudian slip? I'm with you > if you really mean "NTP should distribute TAI"!!! Uh, probably yes. I didn't even see the grammer error when I re-read it the first time just now

Re: The real problem with leap seconds

2006-01-10 Thread Peter Bunclark
On Mon, 9 Jan 2006, Tim Shepard wrote: wot, no attribution of quotes? > > >and you still cannot even get it [TAI] reliably from your > > I still think NTP should have distribute TAI, but I understand using Was your failure to form a past-participle a Freudian slip? I'm with you if you really mean

Re: MJD and leap seconds

2006-01-10 Thread Rob Seaman
On Jan 10, 2006, at 11:06 AM, Poul-Henning Kamp wrote: Let me see if understood that right: In order to avoid computing problems and to get precise time, astronomers rely on a timescale without leapseconds, because the Earths rotation is too unstable a clock for their purposes. Just like ever

Re: MJD and leap seconds

2006-01-10 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, Rob Seaman writes: >> 2. Julian Date (JD) >> >> [...] For that >> purpose it is recommended that JD be specified as SI seconds in >> Terrestrial Time (TT) where the length of day is 86,400 SI seconds. Let me see if understood that right: In order to avoid computin

Re: MJD and leap seconds

2006-01-10 Thread Rob Seaman
On Jan 10, 2006, at 9:17 AM, Peter Bunclark wrote:On Tue, 10 Jan 2006, Poul-Henning Kamp wrote:In message <[EMAIL PROTECTED]>, Peter Bunclark writes: Good grief.  MJD is used widely in astronomy, for example in variablility studies where you want a real number to represent time rather than deal wit

Re: MJD and leap seconds

2006-01-10 Thread Peter Bunclark
On Tue, 10 Jan 2006, Poul-Henning Kamp wrote: > In message <[EMAIL PROTECTED]>, Peter Bunclark writes: > >On Tue, 10 Jan 2006, Tom Van Baak wrote: > >> have no leap seconds. Astronomers appear to avoid > >> using MJD altogether. > > > >Good grief. MJD is used widely in astronomy, for example in v

Re: MJD and leap seconds

2006-01-10 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, Peter Bunclark writes: >On Tue, 10 Jan 2006, Tom Van Baak wrote: >> have no leap seconds. Astronomers appear to avoid >> using MJD altogether. > >Good grief. MJD is used widely in astronomy, for example in variablility >studies where you want a real number to repres

Re: MJD and leap seconds

2006-01-10 Thread Tom Van Baak
> > have no leap seconds. Astronomers appear to avoid > > using MJD altogether. > > Good grief. MJD is used widely in astronomy, for example in variablility > studies where you want a real number to represent time rather than deal > with the complications of parsing a date. It tends to be written

Re: MJD and leap seconds

2006-01-10 Thread Peter Bunclark
On Tue, 10 Jan 2006, Tom Van Baak wrote: > have no leap seconds. Astronomers appear to avoid > using MJD altogether. Good grief. MJD is used widely in astronomy, for example in variablility studies where you want a real number to represent time rather than deal with the complications of parsing a

Re: MJD and leap seconds

2006-01-10 Thread Tom Van Baak
> I've had many heated arguments with co-workers about what the right > thing to do here. Do you compute the day as if it had an extra > second, thus breaking the ability to subtract two MJD numbers to get a > meaningful elapsed time? Or, do you ignore the leap second entirely, > giving discontin