The time of vibration is obtained by means of a chronometer, using the eye-and-ear method.
The ship's chronometer gives the date as being March 21st 3085.
The watch also happens to be an officially certified chronometer.
The above method of determining the geographical meridian has the serious objection that it is necessary to know the error of the chronometer with very considerable accuracy, a matter of some difficulty when observing at any distance from a fixed observatory.
This Chronomat Chronometer is exquisitely crafted in premium grade steel and 18K yellow gold, features a black dial, cambered sapphire crystal along with a unidirectional rotating polished steel bezel.