Moon phase tracking the moon's profit and loss process, including from the new moon, the first month, the full moon to the different phases of the next month. The most complex table with the "astronomy" moon phase needs only to be adjusted every 122 years. Although it is a perpetual "quasi-compulsory" supplement, the Moon phase is a precision movement device that can be used alone on the dial of a pocket watch or watch, depending on its own conditions. The moon phase displayed on the disk can be seen through the window or simply by a pointer. On an ordinary moon phase chart, this disc is painted with two moons, driven by a gear with 59 teeth. A finger pushes the gear a notch every 24 hours. The lunar month displayed by the ordinary moon phase corresponds to 29.5 days, while in reality, one lunar month is 29 days, 12 hours, 44 minutes and 2.8 seconds (29.53 days). The result is that the system will last for about 20 days every 2 years, 7 months and one day less. High-end watches contain a more sophisticated and sophisticated system, sometimes referred to as "Astronomical Moon." This January phase disc is driven by gear with 135 teeth. The accuracy of this device reached a lunar month, 29 days, 12 hours and 45 minutes, minus the difference between the measurable monthly shipment period and the actual monthly shipment period, equivalent to a one-day adjustment every 122 years. Some watches also show "month age," which is the number of days since the last new moon.
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