SJX Watches
Insight: the Compliant Mechanism Inside the Patek Philippe Celestial 6105G
The standout piece from Patek Philippe at Watches & Wonders 2026 was certainly the Celestial Sunrise and Sunset Ref. 6105G-001. The astronomy-oriented watch was a decade in the making and compared to its more conservative predecessor, the ref. 6102, the new model benefits from a complete makeover, both aesthetically and mechanically. Hidden within the 47 mm white gold case is an unusual component that didn’t get the attention it deserved at launch: a butterfly-shaped compliant cam-and-rack mechanism. The system is used for the sunrise/sunset indicators and proves Patek Philippe’s almost savant-like mastery of compliant micro-mechanics. The Celestial ref. 6105 is pictured showing a sunrise of around 8 AM, and a sunset time of about 7 PM. Note the date ring pulls double duty as the sunrise/sunset scale. Fixing something that may be broken Although still quite rare compared to other complications, there are more sunrise/sunset watches on the market than seemingly ever before. They mostly follow the same basic construction: a cam that works with a follower. As the year progresses, the cam slowly turns, displacing the follower. In pairs, such systems are used to show both the sunrise and sunset times, which synchronously vary throughout the year. So why fix something that doesn’t appear to be broken? Or more specifically, why use an elaborate compliant system when a basic cam and follower is a fixture in classical watchmaking? European patent EP3740821B1 granted to ...
