It appears that a biblical day was only an ordinal measurement. Were the
biblical authors concerned about the duration of that time, which would be
necessary to create an interval scale? My guess is no. Thus, the
association of a biblical day to a day based on dynamical time would be a
purely modern choice. A biblical age for the earth would be totally
dependant on that assumed association.
When we estimate the universe's age using an atomic scale, the scale that is
used is really an interval scale. Thus, it would have no true zero point. To
my understanding there is no absolute time scale. We can only assume that
the projected zero point has any meaning. We are free to choose no zero time
for an absolute time scale. Why do we talk about a creation for time, when
the regression equation it taken to infinite density? The resulting Planck
time in not zero and the scale is really only an interval scale. Needless to
say this would go counter to the religious assumption that God is beyond
time. I think it was Augustine who started it. Why do we make such an
assumption today? It does not help build a coherent world view. Would not
an assumption of an infinite time in the past and future lend itself to a
more coherent world view? "In the beginning" in the Bible refers to matter
not time.
Jim Stark