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Re: What is "spacetime" really?
Another thing about wanting to know what time it is: when you "look at the time" you're aware that whatever it says it's only accurate to within a certain limit. Most people deal with a few minutes of inaccurate time-keeping constantly and life goes on - it's important for GPS, the internet, scientific experiments - we like accuracy.
But any recording of any instant of time, is always "what the time was" when it was recorded; when you look at a clock on a wall, you're seeing what time it 'was' not what time it is. It was the time you heard the last tick, or whatever the signal from the device. Ipso facto, now does not exist. But then does.
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