Jim Kelley wrote:
How about this: If the length of the unit time changed by a factor of
two then the age of the universe, using the new metric, would differ
from the old by a factor of two. Same amount of time, but a different
number of units of time.

Because of the effects of gravity and velocity upon
time, the first "second" was probably many magnitudes
longer than our reference second of today. And not
only does the length of a time unit change over time,
it also changes with position.
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73, Cecil http://www.w5dxp.com