perpetual calendar


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perpetual calendar

[pər′pech·ə·wəl ′kal·ən·dər]
(astronomy)
A table or mechanical device used to determine the day of the week corresponding to any given date over a period of many years.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The perpetual calendar, designed in the early 1980s by Kurt Klaus, contains more than 80 individual parts.
To reach such an ultra-thin movement, the perpetual calendar functions, normally arranged on three levels have been merged into one single layer.
To reach an ultra-thin movement of 2.89 mm in height, the perpetual calendar functions, normally arranged on three levels, have been merged into one single layer.
During her talk, Deepa delved upon key topics such as the evolution of the Perpetual Calendar, key historical Calendar watches from the brand, and the technical specificities of these grand complications.
For the new models, the polished cases have been completely reworked with slimmer horns to emphasise the patented Exo Tourbillon mechanism and the Perpetual calendar complication.
This perpetual calendar, however, which does not need to be adjusted until the year 2100, is slender enough (the movement measures 4.05mm in thickness) to slip inside a case just 8.10mm in thickness.
"And this marks the preliminary peak of this development." Retaining all the functions of the original, this new incarnation adds a one-minute tourbillon as well as a full perpetual calendar to the mix.
Perpetual calendar, PS18, Block Design FOLLOW THE STARS We may have a few weeks to go yet until we start following yonder stars and rummaging around for gold, frankincense and myrrh, but these look a treat at any time.
The black dial with its white indexes and hour markers has a central opening allowing the wearer to read the displayed digital elements such as the hour minute and seconds of up to three different time zones three alarms chronograph and countdown functions and a perpetual calendar with day date month year and week number indications.
These third generation IWC diver's watches with a mechanical depth gauge, have more in- house movements and a perpetual calendar function, among other things.
perpetual calendar, the watch has an off-centred chapter-ring accompanied by an arc that shows the date with a jumping retrograde mechanism.