How is Accuracy Measured?

Discussion in 'General Clock Discussions' started by SpaceCowboy850, Nov 9, 2019.

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  1. SpaceCowboy850

    SpaceCowboy850 Registered User

    Oct 29, 2019
    Country Flag:
    I've been exploring mechanical and quartz designs a bit as of late, and stumbled upon this:

    Burgess Clock B
    Burgess Clock B, The World's Most Precise Pendulum Clock, Is Made To A 250-Year-Old Design By John Harrison, Longitude Prize Winner And Inventor Of The Marine Chronometer | Quill & Pad

    A mechanical pendulum clock that loses a bit over half a second over the course of 100 days.

    Then there is this
    World's Most Accurate Clock will Lose One Second Every 14 Billion Years | Digital Trends

    Which is an atomic clock that loses 1 second every 14 billion years.

    So the question for both do they know?

    In the case of the mechanical clock, it was designed 250 years ago, and would have been the most precise time keeping measure at the time, so how could you know if it is losing half a second or not? Likewise with the 1 second in 14 billion years? Is it based on mathematics of what a "perfect" tick would look like and where the pendulum should be given a mathematically perfect tick? Is it based on calculations of where the sun/moon/stars should be, once again, given equations and seeing how that compares to what the respective clocks give?
  2. Willie X

    Willie X Registered User

    Feb 9, 2008
    I'm careful to never use the word "perfect" in any endeavor. :)

    You can buy an Atomic slave for 20 bucks.

    Willie X
  3. shutterbug

    shutterbug Moderator
    NAWCC Member

    Oct 19, 2005
    Self employed interpreter/clock repairer
    North Carolina
    Country Flag:
    Region Flag:
    14 billion years is a pretty safe claim, since nothing mechanical can last that long. 100 years might be a better point for advertising :)

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