Sexy Back: Over The Moon

A. Lange & Söhne puts a case-back on the spotlight with a spectacular moonphase complication


There’s nothing new about a moon-phase complication, but German top-end brand A. Lange & Söhne has taken it to a whole new level with the Richard Lange Perpetual Calendar “Terraluna” watch. Not only does the front dial look impressively sophisticated—and impeccably precise until the year 2100—the case-back also deserves attention on its own. The moon-phase mechanism comprises three separate discs: a 24-hour revolving globe on its axis (with a peripheral 24-hour scale outside the celestial disc), an anti-clockwise moon indicator and two round new moons (dark moon and full moon) underneath it. It reproduces moon cycles accurately (each 29 days, 12 hours, 44 minutes and 3 seconds) that it takes 1058 years before the display needs to be corrected by a single day. As if that’s not enough, the artisans use only solid white gold for the discs and special coating to create that deepblue color. Truly magnificent.

3 2 1

Different cycles of the moon shown on the moon phase display