A 'complication' is any additional horological function to the display of hours, minutes and seconds.
Complicated watches are assigned to one of two categories:
- Complications : watches with one or several additional hands that have a timing function such as Annual Calendar, dual time zones, multiple time zones (World Time), power reserve indication, 10-day power reserve, indication of the state of wind of the movement.
- Grand complications : watches with astronomical indications such as perpetual calendar (with moon phases), perpetual calendar with fly-back retrograde date, astronomical calendar, small and grand strikes, minute repeater, chronographs and split-seconds chronographs, self-winding Annual Calendar Chronograph, tourbillon chronometer with 10-day power reserve, triple and grand complications, sidereal time, running equation of time, sky chart.
Watch enthusiasts can learn more about the lunar phase indicator mechanism by clicking on the left menu. Additionally, if you own one of the three other Grand Complication watches, log-in to the related micro-site using the password that you received with the instruction documents of your watch.