- TL;DR Summary
- The effect of SR and GR on the hands of a clock and its indication of time.
I ask this question as a follow-up of an already answered one (about the effect of velocity on time). I'm looking for the effects of SR and GR on a clock's seconds hand. The effect is very tiny though, as you can imagine. Instead of making the size of the clock vary, we can vary c, the speed of light. Imagine that the hand moves continuously and that it's a massive Born-rigid stick with a mass of one kilogram and length of one meter. It can be treated like 1d. When will effect be noticed? For which c will this be? Will it affect the timekeeping of the clock?