I suspect someone will take exception to the notion of a "single clock"! I say this because the observers have different clocks (different frames), and while a single event could be used to set both to "0", I don't think that really gets at the matter. Maybe the statement below would be as...
Well that certainly is interesting, though probably beyond my current ability to fully understand! My understanding comes only from, in order, "layman" books (like Epstein's Relativity Visualized), followed by half-read undergraduate textbooks, followed by a staggered reading of Einstein's...
That isn't what I said - I didn't say the light travel time wasn't real or is a trick, I said time dilation itself is real and not a trick - there is a logical difference. I understand the article wasn't exactly denying that either but I just said it could be misleading - in the sense that it...
I'm pretty sure it is :)
Of course there are other things around it but the originating dispute was over - assuming B measures a 4.8 light-year distance & light departing at t = 0 - whether 3 years could possibly be correct. That's why the last three statements in the original problem...
In the interests of clarifying things, and saving my sanity, I thought I'd offer some background on how this problem came about and hopefully clarify where the ambiguities may have been introduced.
It all started when this Scientific American article...