Physics, Astronomy & Cosmology / Re: Einstein's Clock: What happens if you move towards a clock at light speed?« on: 29/09/2018 19:19:28 »
If we consider Earth and A to be stationary relative to each other; their clocks can be synced at t=0.Synced in the frame in which they are stationary, yes. Not synced in other frames.
If, at t=0, the ship is stationary relative to A and its clock is synced with A’s clock; the ship’s clock will be synced with Earth’s.No, in the frame of the moving ship, the clock at A is not in sync with the clock at B. So you can say that there is that instant when the ship clock is synced to the departure event at B (synced to an event, not to a clock). Both clocks are present at that event and they both read zero (are set to zero actually) at that event.
However, if we start the scenario with the ship passing A at 0.866c (or any speed); there will be an instant when the clocks on A and the ship can be synchronised (this we call t=0), but at that point the ship’s clock will not be synced with Earth’s.
As for the ship parked before departure, it is stationary in B’s frame, not the eventual frame of the moving ship.