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The tourbillon system was made to compensate the Earth’s gravitational force by mounting the escapement in a revolving cage. It gives the watch a better accuracy. This complication is known as one of the most difficult to make.
The perpetual calendar complication displays the day, date and month, but it requires less adjustment than an annual calendar. This complication knows the number of days in each month but it also knows the year so that it will automatically adjust for leap year. The next time a perpetual calendar will have to be adjusted is in the year 2100.
Minute repeater watches ring whenever you activate the pusher (contrary to chimes). The most complicated ones can ring hours, quarters and minutes.
Watches featuring a moonphase complication display new moons, first quarters, full moons and last quarters.
Watches featuring a « big date » display an oversized window and have two independent date discs.
The night and day indicator is an aesthetic complication which displays on the dial the movement of the sun and the moon. This complication must not be confused with the moonphase.
The jumping hour complication is a means of displaying the hour, shown through an aperture, which instantly changes every 60 minutes.
The date is a small window on the dial which indicates the day of the month (between 1 and 31).