[Data-modeling] Astronomy: CelestialObjects andNaturalSatellites

[Danny Hillis]

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.
>
> _______________________________________________
> Data-modeling mailing list
> Data-modeling at freebase.com
> http://lists.freebase.com/mailman/listinfo/data-modeling