On 10/4/22 15:24:49, Steve Allen via tz wrote:
A decade ago two state of the art atomic clocks would agree with other within 1 second after 300 million years. In 300 million years a calendar based on purely atomic time will have counted 3 billion more days than have been witnessed by people living on the surface of Earth.
On such time scales and much sooner, current astronomical data bases will have been obsoleted by chaos in: o ΔT o n-body celestial mechanics o precession of the equinoxes o stellar proper motions. Necessary empirical corrections will be made. Smearing has proven less disruptive to computer systems than leap seconds. I still favor UT1 as a generalization of smearing. Are pulsar frequencies measured with TAI or UTC? When Standard Time was established in the 19th Century, the width of a time zone was about a day's travel distance. This is obsolete. People cling desperately to the alignment of clocks with solar time. Consider Uyghur civil disobedience in Xinjiang. And yet, historically a six-hour adjustment was made abruptly, since: <https://www.biblegateway.com/passage/?search=Matthew%2020%3A1-16&version=KJV>.
-- Steve Allen <sla@ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB 260 Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 https://www.ucolick.org/~sla/ Hgt +250 m
-- gil