STC Questions

[Francois Ochsenbein]

Quick answer...

>
>Quick note....
>
>Francois states that
>>    The epoch of a coordinate system represents the date to which the
>>    spherical angles are reduced.
>
>I believe that you are defining Equinox here, not Epoch.
>The epoch is the time of observation.
>

OK, my original point

> 2. The Question of Epoch (Question (4) of the RFC page)
>
>    The epoch of a coordinate system represents the date to which the
>    spherical angles are reduced. After reflexion, it looks more logical
>    to attach  the Epoch to the AstroCoords structure (section 4.6)
>

would be better rephrased as

2. The Question of Epoch (Question (4) of the RFC page)

   The epoch of the coordinates represents the date to which the
   spherical angles are reduced. After reflexion, it looks more logical
   to attach  the Epoch to the AstroCoords structure (section 4.6)

(suppression of "system"). To a coordinate system it could be possible
to attach a default epoch.

--Francois

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Francois Ochsenbein       ------       Observatoire Astronomique de Strasbourg
   11, rue de l'Universite F-67000 STRASBOURG       Phone: +33-(0)390 24 24 29
Email: francois at astro.u-strasbg.fr   (France)         Fax: +33-(0)390 24 24 32
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