In message <[EMAIL PROTECTED]>, Rob Seaman writes:

>> 2. Julian Date (JD)
>> [...] For that
>> purpose it is recommended that JD be specified as SI seconds in
>> Terrestrial Time (TT) where the length of day is 86,400 SI seconds.

Let me see if understood that right:  In order to avoid computing
problems and to get precise time, astronomers rely on a timescale
without leapseconds, because the Earths rotation is too unstable
a clock for their purposes.

And in N years, for some value of N, JD's will start at midnight
instead of noon in Greenwich.

"Don't do like we do, do as we say..."

Yes, the irony is rather notable.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

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