Sorry. I didn't clarify that we Bahá'í's have authoritative sources and unauthoritative sources and accuracy is only claimed for the authoritative scripture not individual Baha'i authors but if you want to call it back pedalling then I will concede defeat.
In Cobb's defense he didn't have Google like we do.
Anyway I've learnt much from you and appreciate you correcting me. Please correct me anytime you feel I am wrong as that way I'll improve.
Instead of the generalizations look up astronomy from the 8th to 15th (ish) century. Draper all but ignores it. Draper himself is a horrible source as he trashes religion throughout his book over and over.