If you live your life on a timescale that is anchored to mean solar time, what happens on February 29th? Chris
> -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Michael Sokolov > Sent: 02 August 2011 20:33 > To: time-nuts@febo.com > Subject: Re: [time-nuts] GPSDO for my rubber duckie > > Chris Albertson <albertson.ch...@gmail.com> wrote: > > > NTP software can keep system time within a few milliseconds of UTC. > > No custom hardware, no FPGA or PCB. > > But I _*REFUSE*_ to do it that way. You've mentioned UTC: that's one > thing I'm taking great care to avoid in my solution. I want my system > to be completely insulated from whatever evil things the ITU may do to > UTC and leap seconds. By starting from GPS time coming *directly* out > of a GPS receiver via its native EIA-232 port, I can take untampered GPS > time in the week number + time-of-week format, convert it to TAI by > adding a constant 19 s offset, and then convert from TAI to UTR. > GPS time -> TAI -> UTR; there is no UTC involved at any intermediate > step. > > Standard NTP software is another thing I wish to avoid like the plague > in this project. That software has been touched by the hands of people > like PHK and Warner Losh, the same criminals whose handprints are on the > axe that is about to sever most of the world's civil time from the > millennia-old tradition of mean solar time. Those people are criminals > of the highest degree in my book, and I do not want to use any software > that has been touched by them. > > > If the requirement were for nano second level accuracy [...] > > I don't care for that level of accuracy, but I do very much care about > the philosophical puriry of the system, end to end and at every > intermediate step. > > > but software using Internet pool servers is OK for Milliseconds > > I have no idea / don't want to think about what will happen to those NTP > servers when/if leap seconds are killed. I wish to *insulate* myself > and all computer systems under my care from that insanity. And even now > while the leap seconds are still with us, NTP does an utter mess in the > vicinity of one. Once again, I wish to insulate myself from it. > > Although my rubber duckie will never act as an NTP client, i.e., will > never ask another NTP server for the time, it *will* act as an NTP > server itself, i.e., it will serve my UTR timescale to the public > Internet. For as long as the leap seconds are still with us, UTR will > agree with UTC except in the immediate vicinity of one. However, if and > when the ITU/PHK bastards kill the leap second, the NTP timescale will > fork. My NTP servers will serve UTR, linked to Earth's rotation just > like the current leap-enabled UTC is. Don't know / don't care about NTP > servers operated by muggles. > > I hope this clarifies a little better what I am after. > > MS > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time- > nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.