On Wed 2011-11-30T17:11:38 +0000, Tony Finch hath writ: > Daniel R. Tobias <[email protected]> wrote: > > Speaking of time, what sort of time is the Long Now clock keeping, > > anyway? Solar, atomic, or something else entirely? > > Solar time. It has a mechanism for detecting local noon to keep the clock > in sync.
There are several kinds of time in the mechanism. In particular, it has an orrery which will indicate planetary motions. With a designed resolution of 5 minutes and its expected lifetime the differences between any forms of "uniform time" (Ephemeris Time, Terrestrial Time, Atomic Time) are irrelevant, and the difference between mean solar time and the more uniform time scales can be predicted well enough for its indicators. As Rob mentioned, read the preprint at futureofutc.org -- Steve Allen <[email protected]> WGS-84 (GPS) UCO/Lick Observatory--ISB Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m _______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
