Are moon phase watches accurate?
Most of our moon-phase displays are 99.998 per cent accurate, so if the watch runs without interruption, a correction by one day is only needed when 122.6 years have elapsed. This is achieved with an ingenious mechanical transmission that steps down the rotation of the hour wheel.
Why do observers see phases of the Moon?
The phases occur because the Sun lights different parts of the Moon as the Moon revolves around the Earth. That means the reason we see different phases of the Moon here on Earth is that we only see the parts of the Moon that are being lit up by the Sun.
How do I set my moon phase watch?
- Gently pull the crown to the final position until time stops (position III)
- Turn the crown until you reach the correct moon position.
- As time function rotates on position III, the hands will move while setting moon phase.
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