Steve Allen scripsit:
> The changes in the length of any kind of year are slight by comparison
> to the changes in length of day. Neglecting "short" period variations
> the length of the sidereal year has not changed much in a billion years.
That is to say, the current best approximation to the n-body problem of
the Solar System says that it hasn't. Fair enough. I merely threw that in
in case it was an issue.
> The Gregorian calendar was designed to match the "vernal equinox year".
Thanks for the correction.
> The new fields being added to GPS signals make them able to count leap
> seconds for 30000 years. That's quite an example of engineering margin.
Indeed. But then so is IPv6 (if we ever get it adopted widely).
--
John Cowan [EMAIL PROTECTED] www.ccil.org/~cowan www.reutershealth.com
In the sciences, we are now uniquely privileged to sit side by side
with the giants on whose shoulders we stand.
--Gerald Holton
