Hi, I have an fairly inexpensive watch,. it loses about 5 minutes per week,,. I can access the adjustment + and -,. do I turn the slot towards the + or away from the +,. my father was a watch repairman,,. he died about thirty years ago, the things he told me as a kid went in one ear and out the other,. so I don't recall on the adjustment,. there is no harm to be done, as it's not a valuable watch,. I live in a small town with no watch service,. guess I'm just doing this out of curiosity and something to do,. thanks for any help,. bob,....
Standard-quality resonators of this type are warranted to have a long-term accuracy of about 6 parts per million at 31 degrees C (87.8 F): that is, a typical quartz wristwatch will gain or lose 15 seconds per 30 days (within a normal temperature range of 5 deg C / 41 F to 35 deg C / 95 F) or less than a half second clock drift per day when worn near the body.
If a quartz wristwatch is "rated" by measuring its timekeeping characteristics against an atomic clock's time broadcast, to determine how much time the watch gains or loses per day, and adjustments are made to the circuitry to "regulate" the timekeeping, then the corrected time will easily be accurate within 10 seconds per year. This is more than adequate to perform celestial navigation.
Assuming that you have a computer with internet-synced time and good internet, meaning around 1/100 second accuracy, why not compare the watch to the computer over the space of a week?
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