Chronograph
A watch equipped with a separate measuring mechanism and a separate seconds hand (chrono hand) that allows the measurement of short time intervals (stopped times).
Perpetual calendar
The calendar display of a mechanical watch is called "perpetual" if it automatically updates the date, the day of the week, the month, and the moon phase displays. It not only takes into account the different durations of the months in the course of a year but also "knows" which years are leap years. The complex mechanism is controlled by so-called cams.
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A unique timepiece for the moment and for eternity. In the DATOGRAPH PERPETUAL, Lange combines two classic complications - the | chronograph (for short time measurements) and the | perpetual calendar - in one landmark watch that is also enriched with many of the manufactory's acclaimed new-era attributes.

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