read this:
17 thoughts on “How Long Was a Year In Biblical Times?”
Dr JonesAugust 3, 2013
I think you have missed the point here? The bible years are human assessment of astrological year .so the unit of measurement for man at that time would vary over the astrological time.This difference could be greater at or nearer the equator where daily variance is not soo visually pronounced.
the claims that Moses was 140 upon his death is a cultural claim.This civilization respected age and therefore pumping up the ages of bible figures was done to gain respect as apposed to a biological claim.This with the human measurement of the year at the time caused these inaccuracies.
It is likely Moses would have been around 90 on todays calculations.
The way they kept time and we keep time are very different. I am 46, but in Noah's day would be around 80 right now.