The clock with a thirty-year continuous lunar calendar

Parmigiani Fleurier 2011

Parmigiani Fleurier: Clock with continuous Hegirian calendar from face/2011

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.

A technical feat

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. Inspired by a restoration that he carried out on a simple Hegirian calendar, Michel Parmigiani then successfully led this study which can now be counted as an absolute world first, as no lunar calendar had 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.

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

The Parmigiani clock, which has an autonomy of 30 days, has been produced exclusively in the Haute Horlogerie brand's own workshops. Its dial shows the hours and minutes, the date in Arabic numerals, the day of the week and the month in Arabic calligraphy, the leap years in Arabic numerals and the normal years in the form of indices, the precision moon phases and the power reserve. The cabinet and base are made from solid silver, with decorative details in black obsidian, quartz and ruby. Ten of these clocks, all created with a unique finish and aesthetic, will be available to the public.