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Watches featuring a « sonnerie » complication indicate the hour and quarters by means of hammers hitting bells or gongs which are tuned to different pitches. Chimes were originally made as a means of telling the time in the dark.
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.
Watches featuring a moonphase complication display new moons, first quarters, full moons and last quarters.