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If we surmise that the Strong Nuclear Force can change, then we have to explain why the Sun is still there.A bit in one way, the rate of fusion goes through the roof and the Sun blows itself apart.If we're a bit depleted in nitrogen-14, then we know it's become carbon-14.Could there be other influences that would affect the rate of decay of carbon 14?If it has generally been established as a constant, at what point does the "constant" break down?To do that we need records of how much was being made from nitrogen.To do that we need samples of atmospheric gas, from ice cores or solar activity from tree rings, etc.The constant, that is the Strong Nuclear Force, is absolute.
Carbon-14 has a half-life of 5,730 years so decays fairly quickly to unusable proportions.
We also need to calibrate how much carbon-14 it had to begin with.
How far can you go back in time, and assume an accurate sample with carbon dating?
It seems limited, how can an observer know the state of the decay of a certain molecular structure even 100,000 calendar years ago?
A bit in the other, the rate of fusion drops and the Sun collapses.
Where "A bit" is a few parts in a trillion or less, most likely very much less.