Freaky Fzx Friday - Light is Truth

We know that Light Ain't No Baseball.  No matter how fast you are moving, no matter how fast the object is moving, everybody always measures the speed of light to be exactly the same.

That means that different observers will measure distance and time differently.  

Einstein used trains in 1905 since they were the fastest transportation he had.  Cars were slow, planes could barely fly, and rockets weren't even contemplated for payload transport.  His imaginary trains, however, moved close to the speed of light to conceptually demonstrate special relativity effects - a thought experiment.

Imagine two flashing lights at the front and rear of your train and remember that you are traveling near the speed of light past the stationary train station.  You synchronize those lights while you sit in the middle of the train.  Those synchronized lights are NOT synchronous to the people waiting for the train.

Which perspective is correct?
 Only one, right?  NO.  Both are true.

In Jesus' trial before his crucifixion when he stood before Pontius Pilate, Jesus said "Everyone on the side of truth listens to me."  Pilate responded with "What is truth?" - a rhetorical questions that ended the conversation.  

TRUTH, in the case of our train, IS THE SPEED OF LIGHT - that is the one thing that all observers agree on.  Simultaneity is relative.  

Einstein, Special Relativity, 1905.