If someone is on Earth, and the other is in space, why would their wrist-watch show a different time?

Question

I understand that space travel affects time, but why would it affect the mechanisms of a watch? doesn’t it just go tiktik u know?

In: 11

Answer 1

So a watch’s second-hand motion is 6 degrees per second, which gives a full rotation of 360 degrees per minute. But what constitutes a minute is different depending on your frame of reference.

From my perspective, a minute on my watch passes every one of my minutes (I know this sounds tautological but stay with me). But from your perspective, a minute on my watch passes every 10 of your minutes. So the clock moves at 0.6 degrees per second from your perspective but 6 degrees per second from mine.