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According to my understanding of Einstein's Special Theory of Relativity,both 'time' and 'space' can no longer be regarded as 'absolutes' in thesense that Newton would have maintained, but depend rather on the velocity of the instruments doing the measuring (as, with say, the famous 'twin paradox').
Without evoking the concept of absolute time, what possible meaning can be given to statements like 'The sun is 4 billion years old', or '1 second after the Big Bang' - concepts that are bandied around as if they might be meaningful.
Whenever I have spoken to 'physicists' regarding this problem, it seems that they are not clear as to what is meant either. What theoretical 'clock' is doing the measuring in these instances?