Einstein synchronisation

Einstein synchronisation is a way of measuring time that was suggested by Albert Einstein. It is based on the idea that if you travel away from a certain point in space, and then come back, the time that has passed for you won't be the same as the time that has passed for someone who stayed at that point. So, Einstein synchronisation is a way of making sure that everyone who is looking at a clock is looking at the same time, no matter how fast they are moving or how far they are away.