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Consider the typical simultaneity scenario:

An observer `O' right in the middle of two light signal sources `A' & `B', all three has their clocks synchronized to each other. Now, A & B both emit a light signal simultaneously and then again one second later. After one second from receiving the first signal the observer starts moving(does not matter how fast) towards one of the sources. Now there are two contradicting statements as

1. According to simultaneity problem the second signal would be non-simultaneous w.r.t the moving observer O.

2. And as the speed of light signal is same in every inertial frame, this means w.r.t the moving observer O, speeds of both the second signals should be same. As the moment the signals were emitted the distance between the observer and the sources was same. This means same speed and same distance should result in same time to arrive, therefore the second event should also be simultaneous.

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# Does simulataneity contradicts the constancy of speed of light

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