Comments about "Time_in_physics" in Wikipedia

This document contains comments about the article Time_in_physics in Wikipedia
In the last paragraph I explain my own opinion.

Contents

Reflection

Introduction

The article starts with the following sentence.

1. Markers of time

2 The unit of measurement of time: the second

2.1 The state of the art in timekeeping

3. Conceptions of time

Our modern conception of time is based on Einstein's theory of relativity, in which rates of time run differently depending on relative motion, and space and time are merged into spacetime, where we live on a world line rather than a timeline. In this view time is a coordinate.
It is correct that the behaviour of clocks (its ticking rate) depent about motion. But that does not mean that you can say the same about time.
Using different clocks the position of the objects can be different depending which clock we use and that is not what we want.
According to the prevailing cosmological model of the Big Bang theory time itself began as part of the entire Universe about 13.8 billion years ago.
The only thing that we can say is that the Big Bang event happened at time 0. The physical cause (what happened before) of the Big Bang is unknown.

3.1 Regularities in nature

3.1.1 Mechanical clocks

3.2 Galileo: the flow of time

3.3 Newton's physics: linear time

In or around 1665, when Isaac Newton (1643–1727) derived the motion of objects falling under gravity, the first clear formulation for mathematical physics of a treatment of time began: linear time, conceived as a universal clock.
The idea that time in some sense flows linear is a very powerfull concept, because it is a strong bassis for the definitions of linear movement and accelerated movement.

3.4 Thermodynamics and the paradox of irreversibility

3.5 Electromagnetism and the speed of light

3.6 Einstein's physics: spacetime

3.7 Time in quantum mechanics

4. Dynamical systems 5 Signalling 6 Technology for timekeeping standards 7 Time in cosmology 8 Reprise

9. See also

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Created: 4 November 2017

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