μιας και αναφερεις την εταιρια
The traditional perpetual calendar indicates the day, date, month and moon phases – in addition to the time of day, of course. It takes into account the length of each month (28 to 31 days) without the necessity of making a manual adjustment. The mechanism also takes into account the leap years but requires an adjustment three times in a row every 100 years because according to the Gregorian calendar, every 400 years, the leap year is cancelled for three centuries in a row and is re-established on the fourth century: in 2100, 2200, 2300 etc, the leap year is omitted, whereas in 2000, 2400, 2800 etc. it is re-established.
The Aeternitas Version II is therefore different to any other perpetual calendar since it takes into account the rule governing the Gregorian calendar that states all century years not divisible by 400 are common years and not leap years.
The Aeternitas eternal calendar is a module placed on the dial side of the watch and follows a 1000 year cycle thanks to two additional sets of wheels: the first set comprises a wheel of 10 years, the second a cycle of 100 years and a third that allows for the display of a 1000-year cycle; the second set of wheels is designed for the setting, through the use of cams, of the skipping of the leap years three time in a row every 100 years and its re-establishment the fourth time.
In addition to the usual indications – retrograde date at 12 o’clock, days, months, 24-hour day/night, normal leap year cycle – it also indicates the time equation which is coupled with the calendar, which means that if the watch is not wound for a number of years, at the moment of its correction, the equation of time continues to follow the calendar.
Two time zones utilizing a 24-hour hand are placed either side of the tourbillon at 5 and 7 o’clock and can be set by pushbuttons on the side of the case. The time zone indicator on the right is conceived for travelling eastwards and therefore moves one hour ahead at each press of the corrector on the right side of the case. The time zone indicator on the left is designed for travelling westwards and therefore moves back an hour with each press of the corrector on the left side of the case. Just above the tourbillon at 6 o’clock, is the year indicator which functions from 0 to 999 and then continues along its merry way indefinitely. Now that’s a world-first.
There is a moon phase indicator set just below the date indicator at 12 o’clock that works to a precision of 6.8 seconds per lunar month. That represents an error of a mere 24 hours every 1000 years. Traditional perpetual calendars make that error every 4 years.
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