dog77 Posted November 8, 2014 Share Posted November 8, 2014 My lack of understanding of Cesium clock set aside. My point is that time and distance are both ratios. These measurements are always described relative to something else. Time is the ratio between events we observe over a distance. The speed of light is constant in a vacuum, and the rate of events we observe change relative to the speed of light in a vacuum according to the Lorentz time dilation, an equation derived based on simple geometry, which in turn is based on the postulate that speed of light is constant and all laws of physics are the same in all inertial reference frames. So a ratio of events (time) is changing relative to a constant (speed of light) according to the Lorentz time dilation (equation based on geometry). For me this speaks of an 'underlying mechanism of nature' with cause and effect, but I understand that is a controversy in itself. However the question of the topic is 'what is time?', and I believe it is no more than a ratio of events that happen over some distance, which is also a ratio. If you are digging deeper than this, than it seems like you would ask 'what is the underlying mechanism or mathematics of the events that happen over distance'. Link to comment Share on other sites More sharing options...
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