Since its restart, the manufactory in Saxony has presented twelve models with this complication. But never be-fore has the moon phase been as prominently showcased as in the new Grand Lange 1 Moon Phase.

Grande Lange 1 Phases De Lune, réf. 139.025

Grande Lange 1 Phases De Lune, réf. 139.025 © A. Lange & Söhne

The moon-phase display indicates the time that elapses from new moon to new moon with an accuracy of 99.9978 per cent. The average synodic month lasts 29 days, 12 hours, 44 minutes, and 3 seconds. For the sake of simplicity, most classic moon-phase displays round this cycle down to 29.5 days. The resulting deviation of 44 minutes and 3 seconds per lunation adds up to one day in merely two and a half years. The much more precisely calculated seven-gear transmission of the Grand Lange 1 Moon Phase reduces the deviation per cycle to less than one minute. Once correctly set, and assuming that the watch runs continuously, the display would only have to be corrected by one day every 122.6 years.

 

The more than 300 stars that decorate the intense blue lunar disc were cut-out with a laser with such an extreme precision that it looks like a miniaturized image of the galaxy.