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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.
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.
Watches featuring a moonphase complication display new moons, first quarters, full moons and last quarters.
The power reserve indicator tells you the time the watch will continue to function. It can either be seen on hand winding or automatic watches.
