Re: [time-nuts] Re: UTC - A Cautionary Tale

2005-07-15 Thread Rob Seaman
Warner Losh says: We already have ambiguity in when something occurs, as defined by Earth. Each timezone is 15 degrees wide, and thus something may happen at 11:59:59pm local standard time, but really happen at 12:01:01am the next day 'solar' time. Ambiguity cuts both ways. Standard tim

Re: [time-nuts] Re: UTC - A Cautionary Tale

2005-07-15 Thread Mike S
At 07:07 PM 7/15/2005, M. Warner Losh wrote... >In message: <[EMAIL PROTECTED]> >Rob Seaman <[EMAIL PROTECTED]> writes: >: Historians may care deeply about whether some event >: occurred on one day (as defined by the Earth) as opposed to another >: day (as defined by mid-level inter

Re: [time-nuts] Re: UTC - A Cautionary Tale

2005-07-15 Thread M. Warner Losh
In message: <[EMAIL PROTECTED]> Rob Seaman <[EMAIL PROTECTED]> writes: : Historians may care deeply about whether some event : occurred on one day (as defined by the Earth) as opposed to another : day (as defined by mid-level international bureaucrats). Religious : issues anybody

[time-nuts] Re: UTC - A Cautionary Tale

2005-07-15 Thread Rob Seaman
Poul-Henning Kamp replies: Shouldn't we explore the requirements and use cases before making a change to the standard? Absolutely, but shouldn't we look at more than astronomy while doing so? Are you under the impression that the folks pushing this proposal are looking anywhere beyond t

RE: [time-nuts] Re: UTC - A Cautionary Tale

2005-07-15 Thread Bill Hawkins
Last time I heard anybody jump into an argument with "surely" was in college in 1958. Harrumph. Surely this list hasn't been hit with a group of sophomores because someone posted the address on a campus bulletin board. Chris O'Byrne said, "Civil time should be based on a quadratic formula involvin

Re: [time-nuts] Re: UTC - A Cautionary Tale

2005-07-15 Thread M. Warner Losh
In message: <[EMAIL PROTECTED]> "Chris O'Byrne" <[EMAIL PROTECTED]> writes: : The rest of us need a useable timescale where the sun is basically due : south in Greenwich at 12:00:00.000. However, since the equation of time : introduces a natural error of +/- 15 minutes or so in the exac

Re: [time-nuts] Re: UTC - A Cautionary Tale

2005-07-15 Thread Chris O'Byrne
Surely the way to look at the timescales and leap second issues are to look at the requirements and go from there. It seems to me that there are two basic requirements. Scientists of various colours need a regular timescale, and are not particularly concerned if the sun is above or below the horiz