Citizen Perpetual Calendar
strong>Citizen Perpetual Calendar
If you have a watch with a date window that doesn't 'automatically' change for leap years, etc., how long ...
... would it take for the watch to be correct again if I didn't reset the date every month? This assumes a perpetual battery/power source, so the watch "winding down" isn't a factor. Does anyone have any idea? And is there a formula that you used to arrive at your answer?
(NOTE: This is NOT a homework question ... I'm just curious, but not very good with numbers beyond simple arithmetic.) Also, I think that there's a watch made by Orient that has a self-adjusting perpetual calendar; I think Seiko or Citizen makes variations of them, too. THANK YOU
The leap years are every year divisible by 4 except when the year is divisible by 100, but including years divisible by 400.
If it is correct today in 2008, it would lose 365 days in 1460 years.
But you have to add 14 years for the century years, and then take out the three "400" years of 2400, 2800 and 3200.
So, 1460 + 14 - 3 = 1,471 years (assuming your watch would last that long 
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