How do the moon phases of a Patek Philippe work?

The moon phases of a Patek Philippe mean that certain watches created by the legendary Swiss brand are equipped with dials that will display phases of the lunar cycle. A Patek Philippe watch with a complication that allows for moon-phase tracking comes with instructions to guide you through the process. A calculator tool on the Patek Philippe website, featured in the “Settings” section, can be of help in setting the watch to accurately track the lunar cycle. Shop a range of Patek Philippe watches with moon-phase functionality on 1stDibs.