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I heard that the length of a second is based around our current galactic speed away from the point of origin of the big bang.
It is primarily this speed which gives us our current time dialation which we are familiar with.
If we were on a galaxy which was much further away from the point of origin of the big bang - then we would by definition be moving faster, and therefore incur a dialation whereby our seconds would last slightly longer.
(Using seconds to make it simple.)
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