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[Koen G]

What I don't quite understand is why Draelants calls this 'troubling'.

When Marco sent this diagram to me I initially thought it was just an unusual diagram of "Draco inter Arctos", i.e. the three most northern constellations. (For a lot of examples see Kristen Lippincott's pdf here: You are not allowed to view links. Register or Login to view. )

This is troubling because the dragon of the eclipse is not the same as the Draco constellation, so the illustrator (and author?) is merging two concepts that make no sense being merged. 

Marinus Anthony van der Sluijs, You are not allowed to view links. Register or Login to view. :
"Indian,  Persian  and  Arabic  astrologers  customarily  refer  to  the  lunar nodes  as  the  ‘head’  and  ‘tail’  of  a  cosmic  dragon,  who  is  known  as Gawzar  in  Arabic;  the conventional  Latin  names  are  caput draconis  for the  head,  at  the  ascending  node,  and  cauda draconis  for the  tail,  at  the descending  node."

I skimmed the rest of the paper and it does not appear to mention the manuscripts Marco found, nor any similar tradition. It is clear though that the Ouroboros-like dragon of the eclipses has nothing to do with the constellation Draco, even though there are obvious ways in which both could be confused.