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"Even a broken clock is right twice a day. " Is it really right?

So I posted this quote as my google statues and my friend had an Idea:
"Unless you don't have a reliable standard to compare that clock with, it is useless to consider this fact that the clock might be right 2 times. Clock is a measurement instrument with which you measure something else, so if you wan't to verify it you need another clock which works 100% correct"
What do you think? Shouldn't we consider that maybe others can be right sometimes? How can we define this "standard" that my friend mentioned?

Topics: philosophy
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  • Jul 3 2013: 1) Yes.
    2) Several countries maintain official "standard" time by means of various expensive timekeeping devices (in the USA, it is cesium fountain, cesium tube, AND hydrogen maser devices, which are used to provide an aggregate figure). There is also international consultation and adjustment to ensure that various national standards are workably close to each other. Metrology is always an ongoing process, with constant adjustments being made.

    PS: A stopped 24-hour clock is only correct once a day.
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      Jul 5 2013: First of all thanks for the information and the point about the 24-hour clocks. You are right.
      This sentence of yours: "Metrology is always an ongoing process, with constant adjustments being made." seems like a matter of personal experience. Would you please explain it some more? I always had this assumption that although everything thing is changing, there are phenomenons that we can measure and they are fixed or even if they change, we can predict their changes as well...

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