I think I asked this a while back but I don't think I worded my question properly... so here it is: Imagine if you're in space travelling at a speed in which the time dilation is 1:4 (ie from earth's frame of ref, 1 hour pass in spaceship for every 4 hours pass on earth). Suppose that we have a clock on Earth and a clock in the spaceship. Both says 12pm. The two parties agreed to look at each other at 1pm in accordance to the earth time. So at 1pm on earth time the person on earth looks at the spaceship but on the spaceship the clock says 12:15pm For the person in the spaceship to look at the earth at 1pm earth time, he must look at the earth at 4pm spaceship time. How is this possible? I have googled it but it didn't come up with anything useful.