On Jun 13, 2011, at 2:18 PM, Poul-Henning Kamp wrote: > In message <[email protected]>, Rob Seaman writes: > >> So "day" is a word referring to Earth Rotation? > > As a first order approximation, the same way a year is a first order > approximation to earth orbital position.
Does "first order approximation" mean stationary over long periods of time? Note, of course, that no such language is in the ITU draft. > Poul-Henning > > PS: I read an interesting note recently about how the fact that > years have varying lengths have become an issue for determining the > "official" half-life of long lived radioactive isotopes: Many > geological methods just counted years, but hadn't considered how > long those years were. Reference? Length-of-day varies in the rich and wonderful ways we've discussed, lo these many years. If variation of length-of-year is a significant issue it has not been stated previously in this context. Rob _______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
