|Jun15-12, 03:06 AM||#18|
Are we travelling slower through time due to the Earths orbit?
Everything is different for everyone except the value of c that they will measure. If you start from a different standpoint from that then you will just get a scientific model that doesn't work.
"Travelling through time" is a phrase that makes no sense, in fact.
|Jun15-12, 05:37 AM||#19|
But suppose, for the sake of argument that we had a "speed 'em up" booth within which all physical processes were speeded up. From outside the booth we could look in and see the occupants cramming for finals and finishing term papers in record time.
Of course, for the occupants, time would appear to be passing normally. The second hand on their wrist-watches would still advance at the same old rate, "one Mississippi, two Mississippi, three Mississippi".
If the occupants were to look outside, the rest of the world would appear to have slowed down.
If we had a "slow 'em down" booth, the roles would be reversed. This would allow for "travel in time" with the rate of externally measured time passage being distinctly greater than the rate of internally measured time passage.
But as a practical matter we can agree that there are no situations where an observed asymmetry in the relative rate of time passage is great enough to merit the use of language such as "travel in time".
|Jun15-12, 07:29 AM||#20|
If you really want to talk of time travel, then, when you do it, you travelling 'in' someone else's time. They are the ones who will see something odd happening to you. You will / could be quite unaware of it.
I think these discussions could be more fruitful if there were more concentration on what the observations would be and not on what is 'actually happening'.
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