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January 3rd, 2015, 04:03 AM   #1
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What logic did Newton give in support of using relative spatial measurements?

The crux of space-time is that it is one thing to have abstract concepts of absolute space & time,and it is other thing to describe the actual motion of an object in terms of measured changes of postition during measured intervals of time.

Perhaps Newton understood this very well.

In the Principia, Newton remarked

But because the parts of space cannot be seen,or distinguished from one another by our senses,therefore in their stead we use sensible measures of them. . . And so,instead of absolute places and motions,we use relative ones.
Now,what did Newton want to tell by this statement? What space cannot be seen? What is sensible measure?? Plz help me in understanding the bold phrases.
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January 3rd, 2015, 04:58 AM   #2
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"And so,instead of absolute places and motions,we use relative ones."

I think what Newton meant, that he and his co-centuriers couldn't measure distance, time, velocity using some kind of absolute units. Only thing they had relative units.

But now, we can measure time and distance.

Second is the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.

And meter is 1/299792458 of 1 light second.
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