On Fri 2006-12-29T07:43:56 +0000, Tony Finch hath writ: > Astronomers still count Julian > years (365.25 days instead of exact years) when dealing with long MJD > intervals.
Such intervals are almost always expressed in the IAU's time scale of Terrestrial Time (TT) which is taken to be a more uniform measure than any practically available time scale, including TAI. As such it is a simplification for the sake of human cognition that comes close to the notion of year without any intent to match observable or political reality. -- Steve Allen <[EMAIL PROTECTED]> WGS-84 (GPS) UCO/Lick Observatory Natural Sciences II, Room 165 Lat +36.99858 University of California Voice: +1 831 459 3046 Lng -122.06014 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m
