Swiss or French astronomical watch with solar calendar Circa 1780

Important gold-plated watch with open face from Paris or Geneva
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An important, extremely rare, astronomical pocket watch with a solar calendar, moon phases and lunar calendar within a scale, and central seconds, circa 1780. Probably for the Chinese market.
Gold-plated case, signed Louis LG No. 2985. Original enamel dial with two scales, the lower scale shows the time, above it shows the date according to the solar calendar as well as the moon age and the moon phase, so-called lunar calendar, and central second. Movement with cylinder escapement.
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Diameter: 59 mm
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Weight: 115 g
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Signed: No name
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For us Europeans, the solar year or the (Gregorian) solar calendar applies. Other cultures, such as China, on the other hand, rely on the moon and its different phases. Starting with the full moon, it takes about 29 days (exactly 29.53 days) until the moon has once circled the earth and it becomes a full moon again.