# Thread: the natural unit of time

1. It seems that Planck's unit of time is universally acknowledged as relevant.
I read that nobody knows it genesis, but could anyone explain it, after a century?

- Do you know its rationale? why should the square root of hG divided by C^5 be the least unit of possible time, why C^5?
can it to be considered scientific as the unit Time is on both sides of the equation? (C=S/T)

-I have read a few thread here about Time, well, if it is really universally accepted, can't that be the Absolute time you are desperately looking for?
then the conventional time signal would be just a multiple of it, and provide an answer also to simultaneity.

2.

3. Originally Posted by logic
It seems that Planck's unit of time is universally acknowledged as relevant.
I read that nobody knows it genesis, but could anyone explain it, after a century?

- Do you know its rationale? why should the square root of hG divided by C^5 be the least unit of possible time, why C^5?
can it to be considered scientific as the unit Time is on both sides of the equation? (C=S/T)

Perhaps wikipedia is a good start: Planck time - Wikipedia, the free encyclopedia

4. Originally Posted by tk421
Perhaps wikipedia is a good start: Planck time - Wikipedia, the free encyclopedia
Thanks, I read that and many other articles, does that answer my questions?

5. The answer you are looking for is No. When you say time is absolute it means there is no dilation,no need to study simultaneity and many things Gr has.It means when you look at a supernova explosion,the time which it explodes is the time which you see it.It means that one round clock can be used everywhere in the universe. These are not true.

6. I do not mean that, by absolute, I mean THE standard rate .
Do you know anything about the rationale of the formula?

7. There is no such thing as 'The standard rate' Time has its own rate in every identifiable frame of reference.
Planck-time is just a combination of the great constants of physics that govern the relevant regions of different physical theories. (c, Hbar, G)
Together they make up the elemental constant for time, distance, weight etc.
The reason it is relevant is because the fraction is identical whatever you defined as constants. Meaning it is the same in metric of SI unit. Or whatever units an alien race might use. It is an equation to find a unit for time, which is independend of how we perceive time should be. Still it is of course in seconds. But it could serve as a translational factor for our seconds to another scale of time.

8. Kerling that helps.

9. on a larger scale time is nothing but comparison of one astronomical phenomenon with other.

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