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Watch Guides
How an aperture and a disc track a 29.5-day lunar cycle on your wrist — and why the indication drifts.
The moonphase disc has two moons that rotate beneath an aperture. The disc has 59 teeth; the moon advances one tooth per day. Two full revolutions take 59 days — close to the 29.53-day lunar cycle, but not exact.
That gap (0.03 days per cycle) means a standard moonphase loses one day every ~33 months. High-precision moonphases (Patek, Lange) use 135-tooth wheels and lose one day every 122 years.
Never advance the disc between 9pm and 3am — the date wheel is engaging and you risk breaking it.
