# Time

What is time? And do we need one? I’ll handle time from theoretical point of view. To be more exact, from ToEbi point of view.

What is time?

Let’s define that a certain time is a label for certain configuration of particle(s), kind of still picture from ongoing movie. Based on that definition time has not a quanta. For example, electrons at rest (at least on Earth) spin at frequency of $\approx 8.98755*10^{16}$ Hz, so one rotation takes $\approx 1.113*10^{-17}$ s. Even the slightest angular change causes interactions with other particles hence constitutes a new label. Flow of time consists of these labels. Elapsed time is a bit trickier phenomenon. How can we measure elapsing time if there is an infinite amount of (time) labels between two configurations? Obviously by selecting our sampling method wisely (atomic clock)!

However, the bottom line is that time is purely a man-made concept, it’s very useful concept for us, that’s all.

Do we need time?

Physics in general needs it as well as QM, ST, RT and ToEbi. How can we otherwise make any meaningful predictions? After all, predictions tell something about the future. We can’t see directly those spinning particles and their spin orientation therefore we need more coarse ways to measure the flow of time. Currently we measure time accurately with atomic clocks. Certain amount of subatomic events (absorption or emission) in Cesium-133 atom define one second. This way of measuring time is very natural, after all, everything is constructed from atoms. Elapsed time between the initial and end state of the event can change, causing the emerge of relativity, read Atom Model and Relativity.

Arrow of time

There is an arrow of time. Because of interactions, particles change their spin orientation and spin orientation movement. Good example is light’s linear polarization due to reflection at Brewster angle. If we send that linearly polarized light back the same trajectory it won’t generate arbitrarily polarized light after the reflection hence no T-symmetry. If we ignore the low level changes then we might draw a conclusion that observed reflection is T-symmetric.

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