English: This image shows a schematic depiction of the clock synchronisation procedure that was examined by Poincaré in 1900.
The red lines represent world lines in newtonian space; in the context of Poincaré's examination these are world lines of motion with respect to an unmoving immutable w:luminiferous ether.
The yellow lines represent pulses of light (or pulses of any other electromagnetic wave) that are sent back and forth among a group of clocks that do not have a velocity relative to each other. If the two-way transit time of the signals remains the same, then it has been verified that the clocks do not have a velocity relative to each other. If the clocks to not have a velocity relative to each other, then Doppler shift cancels out.
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'''Description:'''<BR> This image shows a schematic depiction of the clock synchronisation procedure that was examined by Poincaré in 1900. The red lines represent world lines in newtonian space; in the context of Poincaré's examina