sorry my celestial mechanic language was off by one object. I meant the speed of movement of the earth around the sun, not the 24 hr cycle! Orbiting not spinning.
Sylvestru did not think the canopy could be water (many do not--except in a permanently miraculous way, which cannot be ruled out). He round that sugilite, a trace mineral, is an anomaly in that it is located everywhere around the world instead of in concentrations. Had it dropped uniformly everywhere in the Cataclysm? It also reflects sunlight, and is translucently rose-colored, which may have affected what kind of radiation existed prior to the Cataclsym. Interesting thoughts. He also had worked out several things about tectonic plates and the Cataclysm, but before animation was good enough to demonstrate it.
re 'permanently miraculous' see Lewis in MERE CHRISTIANITY or MIRACLES. It's heavy wading, but he has a category called natural vs supernatural miracles. for ex., the fact that grapes turn water in to juice is miraculous, but is not suspending any normal process to do so. The miracle at Cana did suspend them, by speed, and is 'supernatural' as was most of what Christ did. (Using water to amplify his voice by standing in a boat out a ways was 'natural.') Perhaps Gen 1 simply meant that low overcast was permanent.