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Lt Col John (Jack) Christensen
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Great video.
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LTC Stephen F.
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Thank you my friend Sgt (Join to see) for posting the educational video focused on Albert Einstein's Special Relativity. Part 1 From Galileo to Einstein.
Spatial reference is critical in physics whether classical Newtonian or Einstein's Relativity theories.
[This is very familiar to me still, after decades, nuclear physics at USMA, West Point exposed me to Einstein's General and Special Relativity theories. Special Relativity is focused on the relationship between space and time. 'Albert Einstein, in his theory of special relativity, determined that the laws of physics are the same for all non-accelerating observers, and he showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels. As a result, he found that space and time were interwoven into a single continuum known as space-time. Events that occur at the same time for one observer could occur at different times for another.']
In Newtonian physics the example of two passing trains [traveling at different velocities] is a typical example. The spatial reference points of two independent observers [one per train] observe the other train traveling at a different velocity from their own velocity aboard their train.
The Einstein theory presumes that the observers on two different spatial reference points are experiencing time differently - e.g. one traveling less than the speed of light while the other is traveling at the speed of light or greater velocity.

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SPC Douglas Bolton
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Incredible.
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