Current Phase
Age: 0.0 days
Most mechanical moonphase watches (Patek, Lange, Omega) use a 59-tooth gear. This advances the disc one notch every 24 hours.
Step 1: Pull the crown to the setting position.
Step 2: Check the "Age" above (e.g., 14.2 days).
Step 3: If the last Full Moon was 14 days ago, set your moon to "Full" (center), then advance it by the difference if needed.