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The Flyblack function means that the chronograph hand can be reset to zero and immediately started again by pressing once the pusher. That’s why there are two hands for the chronograph.
Chronograph watches can measure and display elapsed time. Usually three subcounters on the dial display the elapsed seconds, minutes and hours.
Worldtime watches indicate on their dial the most important cities of the 24 different time zones worldwide. You can simultaneously tell the time of all these cities.
The 24H indicator is often associated with watches displaying several time zones.
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.