So I just started taking Modern Physics and we are currently discussing special relativity. And needless to say, its giving me a headache. Here's my confusion: First, my Professor is Russian, and while his accent isn't so thick that I can't understand him, his grasp of English itself, is such that, I could have a conversation about the weather or politics with him, but its not good enough that he can be perfectly clear with us and cook up familiar analogies etc.. So I'm having trouble there in general. Specifically though, he was giving an example of Time Dilation where we were to consider the gestation period of like a cow, which he gave as 21 months(why not a human? Who knows.) As our "clock". And we were to suppose this cow was flown out into space at some velocity nearing the speed of light. Ignoring any sort of acceleration for the sake of the example,(I guess?). Then he demonstrated that it would be like 53(or something, not really important right now) months before we got radio transmission of the calf being born. So I asked, what if we were able to receive information from the ship instantly, would it still be some time > 21 months before we heard from the calf? And his response was no, it would just be 21 months. Which, sure, makes sense. So that left me thinking that all of the peculiarities that we see from relativity are just consequence of the time it takes light to travel. Then in reading my text while working some practice problems I read something like this in an example: (and I'm paraphrasing) We have a Train, S', moving at velocity, v(from left to right), relative to a platform, S. The train and platform are labeled, from left to right. B, C, A. Two flashes of light occur at points B and A when clocks at points B and A hit some time, t0. (The diagram depicts the train in line w/ the platform, that is, A' is inline with A, etc...) An observer in S at C records these flashes as simultaneous. An observer on the train, in S', at C', records the flash from A first and then the flash from B, he then concludes that the clocks at A and B are not synced. And I'm good up to here. And then they say this: "All observers in S' would agree with that conclusion after correcting for the time of light travel.[\b]" I understand that the example in the book isn't meant to describe time dilation, but its kind of thrown me for a loop. I think I might just be over thinking it or something.