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Peter Fogg wrote:

> for lack of an alternative we are still using the first point of Aries as 
our longitudional reference point

Nah, maybe another longitudional reference point is needed, but what?  The 
position of the stars relative to each other changes slowly over time.


> I think we still need a north south east west equivilant to designate in 
which quadrant of the sun's orbital plane we are located.

Maybe the answer to both lies in using the earth's orbit of the sun. The 
'quadrants of the sun's orbital plane' is related to our earthly year and 
seasons (remember that the 'first
point of Aries' is the point located on the celestial sphere where the sun 
apparently crosses the earth's equator) so if that was zero the portion of an 
arc measured from there
could be in degrees or as a date and time.


Talk about quaternions doesn't even begin to begin to address the question of 
just how 3D nav. away from earth could be or is achieved.

   

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