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Time

There are lots of different definitions of time, but for me the most acceptable is that time is the unit that measures transformations (movements, changes of state, whatever) of the matter.
If there's no matter, there's no time, because there's nothing that can be measured, so time makes no sense.
If the universe had a beginning from nothing, time first appeared with the appearance of the first piece of matter.
I also could assert that if there's matter but there's no movement, no transformation, there's no time, because if we have a constant state, time makes no sense since all is always the same.
In a immutable universe there are no references to measure time.
If time can't exist without matter, it appeared after of at the same time than matter.

Time can stop if the universe stops all his movements and transformations.
Time is a vector, an arrow that indicates the direction of transformation. If nothing transforms or change, how can we measure time?
No sun clocks, since the sun doesn't chance it's position, no clocks, since nothing move.

Time is the measure of cycles and it's direction is determined by irreversible transformations.

"For the first half of geological time our ancestors were bacteria. Most creatures still are bacteria, and each one of our trillions of cells is a colony of bacteria."

Richard Dawkins

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