What’s the ‘Proper Time’?

Rationalising The Universe

Today’s post revisits one of my favourite themes in Theoretical Physics – time. In previous posts we’ve looked at the idea of the present and how the theory of Special Relativity refutes its absolute existence – and we’ll be drawing on this idea again here. Today I want to discuss the idea of ‘proper time’ and tell you what it is, alongside a deeper explanation of the geometry  of spacetime.

Back in the day it was believed by many, including the great Newton who put together the three laws of motion, that time was absolute. This meant that wherever you went in the universe, a clock at one end of the cosmos would be ticking in synchronisation with one at the other. As though, there was a universal time, running on an almighty clock in the sky and all other clocks in the cosmos would adhere to its pace…

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