Nevertheless, the equivalent of earth days works out perfectly in reconciling the age of the universe.
Schroeder says (and I agree) that creation week must be measured from the inception space/time coordinates (inflationary theory/relativity). After all, God was the observer and author of Scripture.
It works out that 6 days at the inception space/time coordinates are equal to approximately 15 billion years at earth's space/time coordinates.
I agree completely. I am just refining my thoughts for discussions with those who (but not so succinctly) insist that earth's space-time coordinates are all that exist. IOW, that those six "yom" equated to six rotations of earth on its axis WRT the sun. (AKA "Young Earthers")
Showing that the means to measure time in that manner (planetary orbital/rotational mechanics) did not (according to Genesis) even exist until the fourth day -- might get them to condescend to listen to a discussion of the relatavistic reality that you and I, et al, see so clearly.
~~~~~~~~~~~~~~~
Totally irrelevant aside: Do you use something like keystroke macros to generate your ubiquitous "Thank you..." lines?