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The central second is the central hand of the dial which divides the minute into 60 units.
A watch featuring a complete calendar or an annual calendar displays the day of the week, the date and the month but not the bisextile years. The watch needs to be adjusted once a year.
Watches featuring a moonphase complication display new moons, first quarters, full moons and last quarters.
Chronograph watches can measure and display elapsed time. Usually three subcounters on the dial display the elapsed seconds, minutes and hours.