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@Alkali
To test your accuracy, stop the watchby pulling out the crown as the second hand hits 12. Have a look at your phone, if it's 10:47 then wind your watch hands to exactly 10:48 and wang the crown back in as your mobile phone hits 10:48. Boomshanka, you watch matches your phone, which in turn matches ceefax. Have a look at your watch / phone / ceefax tomorrow. How many seconds do they differ by? How much do you care? Divide one by the other for the inverse of the tangent of adjustment.