Recording time is pediatrics that can be played in any small watch and small field. With the development of the world, wristwatches have been endowed with richer functions and become one of the most loved challenges of watchmakers. Moonphase is one of them. The moon phase watch was born in the fierce battle of watch manufacturing at the end of the 17th century and the beginning of the 18th century. After the complicated mechanical tourbillon conquered the clamp of gravity, the moon phase function started the milestone of the intersection of mechanics and astronomy. But at the same time, the moon phase function is also the most controversial watch function-the supporting party said it was a chicken rib, and the disgust accused it of being the most useless watch function. What is the moon phase?
月 The term ‘phase of the moon’ was originally an astronomical term in English. The moon illuminates by reflecting the sunlight, and its relative position with the sun will show various shapes. In short, it is the change in the lack of the moon. Since ancient times, the Gregorian calendar is the current Gregorian calendar based on the Gregorian calendar; the Gregorian calendar is based on the lack of the moon and the moon.
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What is the moon phase chart?
As a carrier of time, the regular movement of the moon phase is naturally included in the clock. As early as the 17th century, clocks had moon phase functions. The large table clock with moon phase display was the original carrier of the combination of clocks and moons. Since then, with the evolution of clock manufacturing technology and form, this function has been logically added to pocket watches and watches.
The moon phase function appeared on the dial immediately, and brought wonderful vitality to the entire watch. Inside this usually semi-circular window, there is often a small round face to hide and seek with you, and this represents the shape shown by the round face of the moon, which happens to be the profit and loss state of the moon.
How the Moon Phase Table Works
The moon phase shows the state of the moon on the moon phase card according to a period of 29.5 days (that is, a month of confluence). This moon card has two moons (patterns) with 59 teeth on the edges. The error caused by this mechanism is so small as to be negligible in terms of the moon phase display function. The precise rotation period of the moon is 28 days, 12 hours, 44 minutes, and 2.9 seconds.
The display of the moon phase usually involves digging out a special shape window on the dial, and using the moon face on the moon card to display it. This particular shape includes a semicircular arc and two small arcs. This well-designed shape combined with the moon on the moon card can tell us more accurately the shape of the moon at the beginning or end of a cycle. This sounds complicated, but in the final analysis, it is just imitating the direction of the moon.
Adjustment of Moon Phase Table
The moon phase watch has an adjustment button on the side of the case, which is used to adjust the indication error. The easiest time to refer to and adjust is to adjust the pattern of the full moon to the center of the window when it is full. Like calendars and weekly calendars, the moon phase disk also rotates in one direction, and it cannot be adjusted in the opposite direction.
The error of the moon phase table
Because the moon’s revolution cycle is not exactly 29.5 days, but 29.53059 days, based on this basic design, an error of about one day occurs every two years. As a result, the masters and masters of watchmaking began to make painstaking research and development and improvement. Today’s most accurate moon phase table, its adjustment cycle has reached hundreds of years, or even thousands of years. Regardless of the life of the watch itself, at least in your lifetime, you don’t have to worry about this issue anymore.
不同 Different moon phases in the northern and southern hemispheres
By the way, due to the different latitudes of the earth, it is not difficult to understand that the moon phases are reversed in the northern and southern hemispheres. If you stand on the northern hemisphere and take the big top, you can see the situation in the southern hemisphere. It’s really ‘secretly changing’ in his face. Currently there is only one IWC Portuguese watch on the market with north and south moon phases indication.