Automatic moon phase watch

An automatic moon phase watch is a complication watch that accurately follows the different phases of the moon — new moon, first quarter, full moon, last quarter — allowing you to observe the continuous evolution of the celestial body with remarkable precision.

Jaeger-LeCoultre excels in the creation of these timepieces, combining technical engineering with elegant aesthetics.

How a moon phase watch works

At the heart of the moon phase watch mechanism lies a lunar disc rotating under a moon-shaped opening, accurately reflecting the changes in the night sky. This movement is orchestrated by a complex system of gear trains, perfectly calibrated to faithfully imitate the lunar cycle.

Automatic movement: a refined mechanism

Jaeger-LeCoultre automatic moon phase watches draw the energy they need from the natural movements of the wrist. This is how the internal oscillating weight powers the main spring and ensures a continuous power reserve. They thus do not need batteries to work: this is what makes them so complex.

Lasting precision

A lunar cycle lasts 29 days, 12 hours, 44 minutes and 2.8 seconds. Most watches round this up to 29.5 days, which results in a slight time lag. Jaeger-LeCoultre automatic moon phase watches incorporate correction systems that ensure unparalleled precision. Depending on the watch, adjustment is rarely necessary. This level of perfection is testament to the Maison’s commitment to offering watches that combine technical performance with aesthetic refinement.