Guy, See the list at http://hpiers.obspm.fr/eoppc/bul/bulc/UTC-TAI.history.
The current and past leapseconds files can be obtained via ftp from time.nist.gov. Dave Judah keeps a current copy for ftp at time.nist.gov.Guy Macon wrote: > (While researching this, I came across the leap second list > at [ http://www.ee.udel.edu/~mills/leap-seconds.3169152000 ], > which expired in 2004. Does anyone know of a newer version?) > > > > In the sci.astro.amateur and sci.astro newsgroups (See "Avoiding > the Leap Second" thread) Quadibloc (John Savard) wrote: > > >>I've come up with an alternate scheme. >> >>Divide the year into ten parts of 37 and 36 days in alternation. Start > >>from March 1 to keep things simple in leap years. > >>For the first 33 1/3 days of each of those parts, sweep increments of >>100 milliseconds "under the rug" by adding one millisecond to the last >>second of each eight-hour period. This would allow a time scale to be >>kept within 0.1 seconds of mean solar time, and it would also mean >>that, most of the time, a time signal would consist of a steady stream >>of SI seconds; the long seconds would come at predictable intervals. > > > An excellent scheme. Let me be the first to say that I approve. > > Looking forward to possible objections to certain seconds being > 1.001 times longer or shorter than most of the other seconds, > that seems to me to be far less troublesome than having some > minutes be some 1.01666... times longer or shorter than most > of the other minutes using leap seconds. > > Here is what I like about this scheme: > > The above scheme and the existing leap second scheme both > result in the exact same length of the millisecond, microsecond, > nanosecond, etc. Those are much more commonly used than the > second is in the areas of physics and engineering. In the area > of computers, time is typically specified as date and time, which > means that the computers already have to work with the occasional > minute that is 59 or 61 seconds long. > > The above scheme results in a length for the minute, hour and day > that is no more than a millisecond larger or smaller than most of > the other minutes, hours or days. This is a thousand times closer > than under the leap second scheme. Months and years would be ten > times closer. > > References: > > The NTP Timescale and Leap Seconds: > http://www.ee.udel.edu/~mills/leap.html > (also touches on GPS) > > The Future of Leap Seconds > http://www.ucolick.org/~sla/leapsecs/onlinebib.html > > Propagation of a leap second > http://members.iinet.net.au/~nathanael/ntpd/leap-second.html > > Leap Second Mailing List: > http://rom.usno.navy.mil/archives/leapsecs.html > _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
