# A riddle: What is the inertial frame of a clock? [closed]

Parts of the clock must be moving for the clock to tick.

-
Rest frame of the center of mass – Mitchell Porter Feb 5 at 9:37
Not even wrong. – user20622 Feb 5 at 9:57
I'll reopen this if you can elaborate more -- currently your question is rather vague. – Manishearth Feb 5 at 14:02
Not to mention we frown on riddle questions. The FAQ does say you should only ask practical, answerable questions based on problems you actually face, which excludes cases where you already know the answer and you're just teasing the community to find it (among other things). – David Zaslavsky Feb 5 at 20:58

## closed as not a real question by Manishearth♦Feb 5 at 14:02

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.

But since the relative velocities and accelerations are ridiculously small compared to $c$ you would have to be an ubernerd to want to take them into account. As Mitchell says in his comment, you would just take the centre of mass of the clock to define its frame.