
Originally Posted by
firebird
What is time?
Do clocks measure time or do they actually measure change in the physical nature of the universe? If so what is time, does it even exist or is it a made up word to describe change and motion? I know it is now, it has been now my entire life and I know everything else exists at this one moment, but change happens at different rates for different things as described in SR so it seems now exists at different times also.
When I say, “now exists at different times” I am using the word time to describe when now exists as opposed to its traditional description of change and motion. Time in this case is relativity, the now actually existing at a moment in time, is this time, what are your thoughts?