Warner Losh said: >> SI >> - the SI-second is a standardised unit of measurement >> - the SI-second is currently defined as a fixed number of transitions >> of a caesium atom >> - the current definition of the SI-second was ratified in 1967 > > Agreed. I'd also add > - the SI-second forms the basis for many other fundamental units of measure. > >> - an SI-based-minute is formed from exactly 60 SI-seconds >> - an SI-based-hour is formed from exactly 60 SI-based-minutes and thus >> exactly 3600 SI-seconds >> - an SI-based-day is formed from exactly 24 SI-based-hours and thus >> exactly 86400 SI-seconds >> > These are true only most of the time. On leap second day, they are all > false and off by 1, typically one low. It all depends on the timescale > that you use, and thus there can't be a universal definition here.
Actually, Stephen is right and you're wrong. The BIPM defines an SI minute, hour, and day in exactly this form. See table 6, page 32, of: http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf This, of course, implies that "SI-based-" is the same as "TAI-". -- Clive D.W. Feather | If you lie to the compiler, Email: [email protected] | it will get its revenge. Web: http://www.davros.org | - Henry Spencer Mobile: +44 7973 377646 _______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
