Simply Abu Dhabi XIII

9 2 S I M P LY A B U DH A B I Richard Lange Perpetual Calendar “Terraluna” Regulator with orbital moon-phase display and 14-day movement T he Richard Lange Perpetual Calendar “Terraluna” is a horological masterpiece that combines A. Lange & Söhne’s benchmark precision, inventiveness, and design competence. Featuring an orbital moon-phase display, a perpetual calendar with the Lange outsize date, a power-reserve of 14 days, and a constant-force escapement, this extraordinary time-keeping instrument represents the pinnacle of Saxon watchmaking artistry. The “Terraluna” is equally impressive on both sides. On the dial side of the 45.5-millimetre pink- or white-gold case, the watch stands out with the regulator layout of scientific precision watches. The movement side presents an innovative and useful orbital moon-phase display that depicts the constellation of the earth, moon, and sun. Three circles for time The large minute circle is at the top of the dial; the smaller dials for the hours and seconds are beneath it, shifted towards the right and left. As was already the case with the Richard Lange Tourbillon “Pour le Mérite” presented in 2011, this dial design was inspired by a great historic role model: JohannHeinrich Seyffert’s 1807 regulator from the world-famous timepiece collection of theMathematics and Physics Salon. With his ingenious designs, Seyffert helped transformDresden into a hub of precision horology in the early 19th century. A great advantage in precision pocket watches, the regulator format was appreciated not only by time-keeping services and observatories, but also by watchmaking manufactories where it was used for synchronising new timepieces. This is because it provided an accurate display of the minutes and seconds. Four windows for eternity Beneath the characteristic Lange outsize date – the first one in a model of the Richard Lange watch family, incidentally – two smaller apertures show the day of the week on the left and the month on the right, so that the calendar displays can be easily read at a glance. The calendar is mechanically programmed to correctly display the different durations of the months in a year as well as those in leap years until 2100. The leap-year indication is located in a small round