On 12 Jun 2007, at 3:49 pm, Steve Allen wrote:
> On Tue 2007-06-12T11:24:58 +0200, Frederic V. Hessman hath writ:
>> Unfortuately, UCD1+ doesn't (yet) have "time.julian" or
>> "heliocentric" atoms
>
> UCD1+ has time.scale
time.scale = "timescale", i.e. the temporal scale of something, and not a time system.
> Please don't use adjectives "heliocentric" or HJD anymore.
> Everything IAU-approved is currently "barycentric".
It may be "IAU-approved", but "barycentric" is not unambiguous: a "barycenter" is simply w.r.t. SOME (but not any particular) center-of- mass, so if you want the Solar System we'll have to come up with something like
ucd="time.julian;time.barycentric;SolarSystem"
(note that NONE of these are UCD1+). The IAU may not used "HJD" anymore, but I know zillions of astronomers who do ;-)
Rick
Dr. Frederic V. Hessman Hessman-at-Astro.physik.Uni-Goettingen.DE Institut für Astrophysik Tel. +49-551-39-5052 Friedrich-Hund-Platz 1 Fax +49-551-39-5043 37077 Goettingen Room F04-133http://www.Astro.physik.Uni-Goettingen.de/~hessman
http://monet.Uni-Goettingen.de ------------------------------------------------------------------------ -------------------------Received on 2007-06-12Z14:23:04