Reference: Einstein’s 1920 Book
Section X (Part 1)
On the Relativity of the Conception of Distance
Please see Section X at the link above.
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Summary
We determine the same two points on the train and on the embankment using the concept of simultaneity. Then we measure the distance between those two points on the train, and on the embankment. We cannot be certain that the two measurements shall be the same.
To get some idea of the logic involved, please click on the link “Continue reading” below.
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Comments
The sense of distance changes with the motion of a coordinate system.
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