Everything you need to know about a watch Moon Phase.

In this article, Team Charlie will answer the following questions:

1. What is a watch? Moon Phase ?
2. What is the difference between a complication Moon Phase And Day/Night ?
3. What should we know about the history of this complication in watchmaking? ?
4. How to read a watch Moon Phase double hemisphere like our Alliance Moon Phase ?
5. What is the difference between a Moon Phase classic and a Moon Phase perpetual ?
6. How to fix the Moon Phase of his Charlie Paris watch ?

• What is a watch? Moon Phase ?

A watch with a complication Moon Phase is a watch that displays the lunar cycle. This complication is usually represented by a small disc or window on the watch dial, which will show the visible portion of the Moon in the night sky.

As a reminder, the Moon Phase represents the visible portion of the Moon, which varies depending on the Moon's position relative to the Sun and Earth. There are different phases, ranging from the new moon (when the Moon is completely in shadow) to the full moon (when the Moon is fully illuminated). Moon Phase can be used to determine planting dates, fishing and hunting activities, and has also been used for lunar calendars in many cultures throughout history.

• What is the difference between a complication Moon Phase And Day/Night ?

A watch with Moon Phase will indicate the different phases of the moon and a clock Day/Night It will simply indicate the daytime using the sun, or the nighttime using the moon displayed on the dial.

Apart from its aesthetic aspect, the complication Day/Night will allow you to set your watch optimally by ensuring that the displayed time corresponds to night/morning (between midnight and noon) or afternoon/evening (between noon and midnight).

• What should we know about the history of this complication in watchmaking? ?

The complication of Moon Phase is actually the oldest feature to have been used in watchmaking. This feature dates back to ancient Greece and the Antikythera Mechanism, which presented an accurate representation of the cosmos, including the Moon Phase.

Over the years, the complication of Moon Phase has become a popular feature of luxury watches. For example, in 1925 we can see the appearance of this complication on a classic watch, with the presentation of the Patek Philippe Perpetual Calendar 97975.

• How to read a watch Moon Phase double hemisphere like our Alliance Moon Phase ?

A watch with Moon Phase The double hemisphere has a disc with openings in two places that allows you to view the moon depending on your position (Northern or Southern hemisphere).

For your information, regarding theAlliance Moon Phase, The Northern Hemisphere is at the bottom and the Southern Hemisphere is at the top. This may seem counterintuitive, but it is due to the direction of rotation of the C105 movement's disk.

• What is the difference between a Moon Phase classic and a Moon Phase perpetual ?

Unlike the movements Moon Phase classic ones that require manual adjustment of the Moon every 2 years and 235 days, a Moon Phase perpetual will only require manual adjustment after 122 years and 51 days, as long as the watch is working.

• How to fix the Moon Phase of his Charlie Paris watch ?

Step 1 : Set your watch.

Step 2 : Refer on the calendar Moon Phase See below for the date of the last new or full moon.

Step 3 : Depending on the nearest date, whether it's a full moon or a new moon, take the tool provided with the watch and press the corrector (located at 8 o'clock on the dial) the required number of times. Case) to make a full moon or a new moon appear on the lunar dial.

Step 4 : Next, depending on today's date, refer to the last nearest full moon or new moon and calculate the number of days difference.

Step 5 : Retrieve the tool provided to adjust your Moon Phase and press the corrector button the required number of times.

If all of this still seems unclear, here's a concrete example. :

Let's say it's January 20, 2025.

First, I set my watch.

After checking on a lunar calendar, I know that the last closest full moon was on January 13, 2025.

So I take my tool and press the corrector, located at 8 o'clock on the..., the required number of times. Case of my watch, to make a full moon appear on my dial.

I then calculate the number of days between the 7th (date of the full moon) and the 16th (today's date), which is a difference of 7 days.

I take my tool again and this time I press the corrector 7 times.

And there you have it, the Moon Phase is settled for 122 years and 51 days (if the watch hasn't stopped in the meantime)!