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Calendars in Watchmaking - The History of Perpetual Calendars
We all know that our year is made of 365 days, and has months that have a different number of days - and one of them, February, also changes every four years. As you can readily understand, this was a real issue for the watchmakers wanting to record and show not only the time on the clocks and watches but also the date.
So, where did this issue come from?