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How does the moon phase on a watch?
The moon performs a complete rotation around the Earth in 29 days, 12 hours, 44 minutes and 2.9 seconds precisely. A lunar cycle is accepted as the equivalent of one month, to one or two days.
The moon phase on the watch is a miniature representation of this celestial movement seen from Earth. It is composed of a disc with two identical moons, which usually runs through a semicircle opening.
The moon disk has either a 59-tooth gear that advances one notch every 24 hours and needs to be corrected every 3 years, a 135-tooth gear that is accurate for 122 years. The lunar disc rotates according to the lunar cycle.
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Celestial bodies
H. Moser & Co. Made some improvements to the complication. First, the HMC 801 manual movement includes a moon phase system equipped with a complex wheel, so precise that the difference is negligible at 0.23 seconds per day, or a shift day after 1027.30 years! It's one of the most accurate, if not the most, moon phases available on the market.
Second, the independent watchmaker chose to present the moon phase via a large round window at "6" on a totally blank dial. This allows all the attention to be directed to the moon in all its splendor.
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To make it look more mysterious, one of the dial's options is Vantablack, a dark substance made up of carbon nanotubes used in telescopes and thermal camouflage of the army. The nanotubes are aligned vertically next to each other and absorb almost 100% of the light, making the blackest dial ever produced in watchmaking. This beautiful black dial is associated with a steel case.
Like the midnight blue dial, its soothing luster gives the moon a surrealist decor. This dial matches a red gold case.
This article was first published on my.asiatatler.com.
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