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Sorry I didn't explain that very well. Suppose you have three lines of
position forming a triangle. If the GP of all the bodies is in the
direction away from the triangle, ie the "outward pointing normals" or
all the opposite way, then the position is in the incentre . If
however two are inward and one is outward, or vice versa then you get
the excentre corresponding to the odd one out!

Bill

On Sat, 4 May 2019 at 16:04, Geoffrey Kolbe
 wrote:
>
> "........the true position is ....... one of the excentres, depending on 
which side of the lines of position the GP of the body is on."
>
> Why should one of the excentres be so favoured...?
>
> Geoffrey Kolbe
>
> 

   

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