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We have different kinds of time depending on the measuring tools of time, we have mechanical time using traditional clock, the atomic time with atomic clock, electronic time with circuit vibration, space time with sun clock, the biological time if locked in a dark cave. They are not measuring the same thing, or same motion, are they necessarily the same time? 

We do not know the smallest unit of time since we can divide any space motion unlimitedly like divide space itself.

If human body dose not decaying  how do we feel of time? We may say there is no such thing as time.

Time is associated with motion or change of state, if the change happens in space, the change of space is defined as time t=dx. if the space can be divided into infinite smaller unit, so is time in this case.

If the change is happening in color pattern, the smallest time unit is the single process of color change, we can not measure unit smaller than that whole process of color change. If we use this time to measure other motions, we can not be precise like using integers to measure distance. We don't know where is the half way of a color change pattern.

We also assume the process of color or space change is even and stable, otherwise the whole thing of time is meaningless. 

So time is not an independent concept, in the above two cases, one time have the smallest unit, the other is not. Is the time the same in the two cases?  If we put the two process together, we can use the space clock to measure color change, but not the other way around.

So a ideal clock is like having a even and smooth process, unlimitedly dividable.

If a object that will never change a bit, like god enjoying eternity, time dose not exist to it, even though things around may change and it own feels time from outside, not inside. But with inside changing present, we feel time both ways, the inside and outside times. We generally use outside time to measure time. If we can shorten or prolong our body existence relative to the outside time, the outside time has limited influence on our perception of time. 

Absolute timing means an even and stable motion available, to know that there must at least have a dual clocks to set up a mutual reference for each other. After a long separation in space and experiencing many conditions, when the two clocks meets again,  they must read exactly the same. But no process of movement can assure that. We know light changes behavior under different conditions, what movement is not? Do we have a universal standard movement to measure time? No. 

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