What devices would people use to tell time on a tidally locked planet?

My question is as stated above: if a planet is tidally locked to its sun, how would the people on the surface, assuming it's habitable, be able to tell time? What devices would they be able to use? Obviously a sun dial is out of the question.

I am also curious as to how they would develop a concept of time because they wouldn't be able to note the passage of time nearly as easily. I understand things would still grow and change, but this would take much longer.

So, assuming they evolved on this planet, what would a device look like to measure time on this planet, and how would this device have come about to begin with?

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What devices would people use to tell time on a tidally locked planet?

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