Displaying the current phase of the moon on the dial of a mechanical watch may not sound like a big challenge. But in practice, it is complicated. The main difficulty lies in the fact that the moon does not follow an exact 24-hour rhythm. Generations of watchmakers have tried to display the moon’s orbit of 29 days, 12 hours, 44 minutes and 2.9 seconds as realistically as possible on the dial of a watch.
To adjust the moonphase function pull out the crown to position 2 as explained in the instructions provided. You can then move the moon around in a clockwise direction. The simplest way to set the moonphase dial is to wait until a full moon and then set the full moon icon at the top of the dial. However if you would like to set the moon in its exact phase immediately it is necessary to research the current phase of the moon either online or by an almanac. Remember it will take almost a month for the Moonphase dial to turn so it will be hardly noticeable on a daily basis.