The most romantic complication. From classical Patek and Lange moonphases through De Bethune's 3D spherical lunar disc, the moonphase is watchmaking's most-loved decorative complication.
Photo: Fratello · May 14, 2026
A moonphase complication shows the current phase of the moon as a small disc rotating through a "bay" cutout on the dial. The standard mechanism rotates one full disc cycle every 59 days (two lunar cycles of 29.5 days each); the disc is painted with two moon images visible through the dial cutout. Standard moonphases drift by 1 day every 32.5 months; astronomical-grade moonphases (Patek 5159, Lange 1815 Moonphase, A. Lange Datograph Perpetual) drift by 1 day every 122 years. Modern De Bethune built a 3D spherical moonphase with palladium and blued-steel hemispheres rotating to show actual lunar visibility from Earth.
Moonphase watchmaking dates to the 16th century (early astrolabe pocket watches and ecclesiastical clocks). The wristwatch moonphase was rare until the 1980s; the Patek Philippe ref. 3940 perpetual calendar (1985) and the Patek 5396 annual calendar with moonphase (1996) re-opened the category at the haute-horlogerie tier. Today every serious complications house has at least one moonphase reference; mid-tier brands offer cheaper but mechanically simpler implementations.
The mechanism: a 59-tooth wheel driven by a daily-advance finger, rotating a disc with two moon images. The 59-tooth ratio gives 29.5 days per moon, matching the lunar synodic month to within 44 minutes. Astronomical-grade moonphases use a 135-tooth or 270-tooth wheel for the longer drift period. A. Lange & Söhne's 1815 Moonphase and the modern Patek 5159 are the canonical haute-horlogerie modern references.
The visual language matters as much as the mechanism. Patek tends toward gold-on-blue-lacquer disc with hand-painted stars; Lange uses an unembellished blued-steel disc against frosted gold; H. Moser & Cie. often integrates the moonphase into the fume dial as an almost-invisible feature; De Bethune's 3D spherical moonphase rejects the disc entirely. See also: moonphase wiki, perpetual calendar.
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