Please forgive my ignorance in STO, but I don't understand something about the following thought experiment. Spaceship flies from Earth with large speed. We observe the clock inside the spaceship from Earth with strong telescope. We see the clock showing 12:00. When we see on the clock 12:05 (in telescope, from Earth), the ship will be further from Earth, so it will take to the light more time to reach us, so on Earth more than 5 minutes will pass. From this I deduce, that for observer on Earth the time on the spaceship goes faster, than on Earth. But if the spaceship approaches the Earth, then we well see 12:05 in less than 5 minutes, and it means the clock on the ship goes slower, than on Earth. From STO we know, that clock always goes slower in a moving system (for external observer). Where is the mistake in my thought experiment? Thanks in advance.