could someone give a precis of teh "argument" per se?

koobydoobydoo is tiresomely opaque
with his equationary, although there is some hope that
Snell's law of refraction will eventually be used --
by the IPCC, not koobydoobydoo!

Bottom line:
The rate of precession of the equinoxes at 1850 is
according to this paper 5025.48 arcsecs per century.