Re: [LEAPSECS] What's the point?

2011-02-14 Thread Tony Finch
On Mon, 14 Feb 2011, Mark Calabretta wrote: On Fri 2011/02/11 15:42:41 -, Tony Finch wrote See for example http://six.pairlist.net/pipermail/leapsecs/2011-January/002124.html where Rob Seaman wrote Civil timekeeping is cumulative. Tiny mistakes posing the problem will result in large

Re: [LEAPSECS] What's the point?

2011-02-14 Thread Rob Seaman
Tony Finch wrote: Rob frequently argues that we can't use a pure atomic timescale as the basis of civil time because of the quadratically increasing offset betwee UT1 and TAI. Well no, I don't think I've ever made such an argument. It is a question of rates, not offsets. And the two

Re: [LEAPSECS] What's the point?

2011-02-14 Thread Paul Sheer
Tony Finch wrote: Furthermore using timezones to keep civil time in sync with the sun leads to simpler software and it will work for over ten thousand years. No. Breaking timezones on top of breaking UTC with the apparent motivation of allowing TAI to be suppressed is bad on top of

Re: [LEAPSECS] What's the point?

2011-02-14 Thread Steve Allen
On Tue 2011-02-15T02:07:59 +0200, Paul Sheer hath writ: In any case, whatever solution ye'all come up with should not merely be In Principle. It should come as a patch on some real code. Which part of this is not already implemented by the code when it uses the right zoneinfo files? To be

Re: [LEAPSECS] What's the point?

2011-02-14 Thread Mark Calabretta
On Mon 2011/02/14 18:00:02 -, Tony Finch wrote in a message to: Leap Second Discussion List leapsecs@leapsecond.com Rob frequently argues that we can't use a pure atomic timescale as the basis of civil time because of the quadratically increasing offset between UT1 and TAI. You yourself made

Re: [LEAPSECS] What's the point?

2011-02-14 Thread Paul Sheer
On Mon, 2011-02-14 at 16:23 -0800, Steve Allen wrote: Which part of this is not already implemented by the code when it uses the right zoneinfo files? 1. let say we want a future where timezones are adjusted by 30 minutes whenever the sun starts rising too late. Write this into the Olson

Re: [LEAPSECS] What's the point?

2011-02-14 Thread Rob Seaman
What's the point? Two links to refresh the discussion: http://www.springerlink.com/content/g216411573882755/ http://maia.usno.navy.mil/eopcppp/eopcppp.html Paul Sheer wrote: I think what you will find is that there is no technical difference between moving leap seconds into