We’re three complications in and have only 12 more to go! The displays on the dial are symmetrically perfect. Speaking of the dial – it’s 18k white gold in a very subdued slate-colored opaline. The subdials at 9, 12 and 3 o’clock feature the day, month and date, respectively. An asymmetric leap year indicator is tucked away at 1 o’clock. Opposite that, there is an “equation of time” complication. This short hand, reserve-like half dial at 10:30 measures the difference in minutes between solar time and standard time.

(See, humans divided each year into 365.25 days, then days into 24 hours and hours into 60 minutes. We needed some standardization. But in reality, the time as shown by the sun has a daily variation of ±16 minutes. Vacheron has solved this problem for you.)

Another rare complication at 8 o’clock and 4 o’clock is the sunrise and sunset times. It informs the wearer of the sunrise and sunset for that particular day in a particular part of the world. How does the watch know what part of the world? It doesn’t, initially. But the client will inform Vacheron, who will in turn tailor the movement to relate to that city.