[Data-modeling] Astronomy: CelestialObjects andNaturalSatellites

[Ed Laurent]

Hmm. I guess it comes down to differences in modeling styles. I'm reluctant
to allow users the opportunity to add data to properties that are not
relevant to the topics they are typed to, even if it would be rare and in
error.

-Ed

On Sun, May 4, 2008 at 12:34 AM, Danny Hillis <danny at appliedminds.com>
wrote:

> I would be happy to put these properties on a type called
> Geosynchronous Satellite,  I just think Earth Orbiting is the wrong
> concept to tie it to.
> -Danny
>
>
> On May 3, 2008, at 7:43 PM, Ed Laurent wrote:
>
> >
> > > Earth orbiting satellites will get their own special properties like
> > > latitude or local time crossing the equator and that will be
> > > dependent on a co-type that will probably be dependent on their type
> > > of orbit. I haven't gotten to that point yet.
> >
> > But these properties are not really connected the fact that the
> > satellite is an Earth Orbiting Satellite. Many Earth Earth Orbiting
> > Satellites do not have them, and satellites in synchronous orbit
> > around other planets do have them.
> >
> > Maybe latitude was a bad example.  LatLong might be a system that
> > can be used for any sphere. I don't know. However, "local time
> > crossing the equator" (e.g., Landsat 7 is around 10:30 am) is
> > probably unique to geosynchronous Earth orbiting satellites. There
> > are probably similar properties of geostationary Earth orbiting
> > satellites that have cultural or similar relevance that would be
> > unique to the planet we live on. Some of those properties might be
> > the same for geosynchronous and geostationary satellites and could
> > therefore reside on a more generic Earth orbiting satellite type.
> > That would also permit the differentiation of Earth orbiting and non-
> > Earth orbiting geosynchronous satellites without needed to build
> > mostly redundant models.
> >
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