"Peratt's scholarly intuition is that 'it would be extremely difficult
   for a planetary plasmasphere to become opaque enough to entirely blot
   out the Sun'". Cardona's emphasis.

   Cardona follows the Peratt quote with: "Thus, together with other
   evidence which I shall soon be supplying, the conclusion has been
   reached that, during the Saturnian age of darkness, the Sun was not
   merely hidden, that is obscured. Like the Moon it was actually absent.

-- Greycloud, Sun Sep 28, 2008, blog

What Cardona does here is to take the mythological statement about
"darkness" and makes it absolute, even though a moment's reflection would
suggest that all plant life would come to an end. Even the Popol Vu claims
only a "shadow" fell on Earth. But making "darkness" absolute, then
eliminates the Sun altogether, if Peratt suggest that it would at least
shin ethrough the enclosing plasma. That is _one_ conclusion of the _two_
possibilities. 

Even Gray Cloud notes:

   The phrase 'together with other evidence' implies that Peratt's
   statement is evidence when it is the very opposite, as Peratt implies
   that the Sun is there.