The 10 Most Accurate Moon Phase Wristwatches Today, Plus Honorable Mention – Reprise

Moon phase mechanisms in a watch can vary dramatically with design and accuracy, but the most basic moon phase mechanism uses a moon phase disk with 59 teeth and two moons that when advanced once a day makes a half rotation every 29.5 days Without further ado, here is an updated list of the top ten most accurate mechanical moon phase wristwatches today Number 11: Ferdinand Berthoud FB 1L.

The Ferdinand Berthoud FB 1L features a very unique moon phase display that actually seeks to show the age of the moon along with the phase as a tool to aid in calculating longitude while navigating at sea, or at least in honor of the brand's namesake and his work toward a related goal The watch is incredible in many impressive ways, but the reason it makes this list with an honorable mention is thanks to its very accurate moon phase display that is only off by one day every 577 years The still reigning king of the moon phase is .

Number 1: Andreas Strehler Sauterelle Lune Perpétuelle 2M, the most accurate moon phase ever in a wristwatch Before the moon phase needed to be set based on the full moon or new moon position and then the time adjusted to get it as close as possible Strehler has since introduced a new watch named the Lune Exacte that features the same moon phase function but adds a Vernier scale to chart the age of the moon so that one can now adjust the moon phase to within three hours precision at any time throughout the synodic month. Source