NavList:

I thank you for the explanation of side vs. perpendicularity error. Yes that makes sense to me. I remember reading about it in a manual....it didn't stick aparently at the time...that part of my brain went on vacation without me....new enough at this art so every day is a voyage of discovery...... 

I have so far focused on sun/moon lunars.

Moon/star and moon planet sound interesting. 

Due to limited availability of sun/moon, a lunar navigator must have had other choice targets.  I was eyeballing jupiter last night up there in scorpio and wondering how that might be  I have read that the most critical thing in moon and stars/planets is that they track closely to the ecliptic for reasons of accuracy due to divergent angles reducing accuracy.