On Mon 2011-02-07T14:39:10 -0700, Warner Losh hath writ: > >Are you sure you aren't confusing red shift (which has been > >a known factor since the 60's) with blackbody shift (which > >only arose in the 90's as clocks hit the 1e-15 level)? > > I may well be confused between the two...
Astronomically-speaking neither one has a relevant effect. The IAU did not object when BIH/BIPM changed the rate of TAI by 1e-12 on 1977-01-01. Whereas the SI second was based on the ephemeris second, and the ephemeris second was originally specified to 1e-12, the effect of the rate change amounts to 0.25 s over the entirety of written human history. No astronomical observation was ever likely to distinguish the change. -- Steve Allen <s...@ucolick.org> WGS-84 (GPS) UCO/Lick Observatory Natural Sciences II, Room 165 Lat +36.99855 University of California Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
