----- Original Message ----- From: "Dave Herald" <DRHerald@bigpond.net.au> To: <IOTAoccultations@yahoogroups.com> Cc: <RASNZoccultations@yahoogroups.com>; "PlanOccult" <planoccult@aula.com> Sent: Friday, April 13, 2007 10:48 AM Subject: [PLANOCCULT] Extracting time from the internet > Every so often the issue of obtaining accurate time over the internet > arises in this forum. > > Recently I downloaded a freeware program called Chronos. It synchronises > the PC clock with about 15 time servers, and promises time to an accuracy > of 0.1 secs. In its on-screen display, it shows the time differences from > each of the servers, and indicates a 'latency' period. A user of this > software would probably believe that their PC clock was accurate to about > 0.1 secs. > > I have now down a number of tests on the accuracy of the PC clock when > synchronised with this software. I did this on two PC's and a Laptop, over > a couple of days. One of the problems with assessing the accuracy of any > clock is having a reliable independent source of time - and I have a > purpose-designed receiver for extracting accurate time from GPS signals > which is accurate at the microsecond level. What I can report is that the > PC clock when synchronised with Chronos is consistently about 0.5 to 0.6 > secs behind UTC. > > For your information.... > > > > Dave Herald > Canberra, Australia > > > > ------------------------------------------------------------------ > To unsubscribe : E-mail to listserv@Aula.com : unsubscribe planoccult > In case of problems : contact Pierre.Vingerhoets@telenet.be or Jan Van > Gestel (jan@vangestel.be) > ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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