Moon Struck

Moon Struck

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< Parmigiani >

Available in limited edition of ten, Parmigiani’s thirty year continuos lunar calender clock ,the Hegirian clock, is worlds first

Never before in the history of watchmaking has a Hegirian mechanical continuous calendar been invented by a Swiss Haute Horlogerie company. The only one of its kind in the world and achieved after many years of research, the Parmigiani thirty-year continuous lunar calendar clock indicates the time over a lunar cycle lasting 30 years, alternating the 19 normal years with 11 leap years. Based on the ephemerides from the Paris Observatory, Parmigiani Fleurier’s thirty-year lunar calendar is theoretical as it is based on the observation of the celestial mechanical movement. Speaking about the clock exclusively to Watch World, Michel Parmigiani, the founder of Parmigiani Fleurier, said he was inspired to create the one-of-itskind clock in 1984, while working on the restoration of one of the earliest wrist watches from the early 15th century, which was based on the lunar calendar. The lunar calendar, a base shared by the Hegirian or Islamic calendar, is calculated on a year of 12 lunar months, each alternating either 29 or 30 days. The Hegirian year, shorter than the Gregorian year, has 354 or 355 days. This difference, due to the last lunar month which contains 29 or 30 days, determines the years known as ‘normal’ years with 354 days and the ‘leap’ years which have 355 days. The most common thirty-year periodical lunar cycle alternates 19 normal years with 11 leap years. These leap years occur on years 2, 5, 7, 10, 13, 16, 18, 21, 24, 26, and 29.

The lunar month starts when the moon is in line with the sun when seen from the earth, known as the conjunction. The month is defined as the average duration of one orbit of the moon around the earth (approximately 29.53 days). But to the naked eye, the first crescent of the moon may be visible from Morocco but not from Kuwait.

The first studies and the registration of the patent for the continuous thirty-year calendar had already been orchestrated by Michel Parmigiani and date back to 1993. The clock can now be counted as an absolute world first, as no lunar calendar has ever been designed to operate continuously. Requiring no intervention from the user, the continuous calendar automatically corrects the lunar cycle. In addition, the clock offers a choice of two leap year cycles. The user simply needs to know the type of calendar used in the current location, and to set the clock accordingly. “The calendar is an eminently fascinating watchmaking complication  as it really is the mirror of civilisations,” says Michel Parmigiani.

This extraordinary invention is a milestone advancing the understanding and development of a Hegirian calendar and paying tribute to the Islamic calendar.

On why he chose to base his clock on the lunar calendar, Michel Parmigiani says, “The lunar calendar is much more precise and efficient. Moreover, it can be set independently, depending on where you are.”

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