A moon phase watch is no ordinary timepiece. Beyond telling time, it elegantly captures the lunar cycle, adding a celestial touch to your wrist. With its unique blend of history, artistry, and functionality, it has remained a favorite among watch enthusiasts and collectors alike. But what exactly is a moon phase watch, how does it work, and how can you set one? Let's explore these fascinating timepieces in detail.
Understanding a Moon Phase Watch
A moon phase watch displays the current phase of the moon as seen from Earth. The watch typically showcases the progression of the moon across four key phases of its 29.5-day cycle: new moon, first quarter, full moon, and last quarter. This display is commonly housed in a crescent-shaped aperture on the watch dial, with the moon represented by a rotating disc.

What makes moon phase watches so extraordinary is their marriage of practicality and beauty. Practical for their origins in navigation and farming, yet artistic in the intricate designs they present on the watch face. Modern innovations have also elevated their durability, often featuring tough materials like sapphire crystal, known for its scratch resistance and clarity. If you're searching for both function and timeless charm, a sapphire crystal watch with a moon phase display may be the perfect choice.
A Brief History of Moon Phase Watches
The origins of the moon phase complication can be traced back to some of humanity's earliest efforts to measure time. The first known mechanism to track the moon’s phases is the Antikythera Mechanism, an ancient device believed to date back to around 150 BC. Fast forward to the wristwatch era, the first moon phase wrist watch gained prominence in 1925.
Historically, the moon phase complication has been cherished for its usefulness in navigation, agriculture, and even spiritual practices. Though modern technologies have replaced these practical applications, the moon phase watch continues to be celebrated for its craftsmanship and its romantic evocation of the lunar cycle.
How Do Moon Phase Watches Work?
At the heart of a moon phase watch is a rotating disc featuring an identical moon. This disc moves incrementally each day, faithfully mimicking the moon's position as it orbits Earth. Standard moon phase watches use a 59-tooth gear, requiring manual adjustment approximately every two-and-a-half year. However, higher-end models with more sophisticated mechanics can stay accurate for over a century.

Additionally, many automatic mechanical watches (like those in the Behrens collection) include a self-winding feature. This ensures you rarely need to adjust the time manually, adding an extra layer of convenience.
How to Set Moon Phase for Behrens Constell Watch?
Setting the moon phase may seem daunting at first, but it’s a straightforward process if you follow these steps:

Check Today’s Moon Phase
Use a trusted source like moon phase calendar or any other lunar‑calendar app.
Pull Out the Watch Crown
Gently pull the watch crown to its second position (usually used for setting complications). Avoid doing this between 9 PM and 3 AM, as the watch gears are particularly delicate during these hours.
Adjust the Time to Move Moon Phase Disc
Rotate the crown to move the time adjustment disc and moon phase disc. Align the full moon, new moon, or appropriate phase based on today’s lunar date.
Sync with the Date Indicator (if available)
Some mechanical watches also have a date indicator. Make sure the moon phase and date are synchronized to avoid discrepancies.
Return the Crown
Push the crown back to its original position, and your moon phase wrist watch is ready to wear.
If you’re setting a mechanical watch for the first time, keep an eye on any instruction manual or guidance from the manufacturer, like Behrens Watches. Proper care ensures longevity for these delicate yet precise instruments.
Why Choose a Moon Phase Watch?
Moon phase wrist watches are more than just time-telling tools. They are wearable works of art. Here are a few reasons why they attract such admiration:
Craftsmanship
A moon phase watch showcases the complexity and mastery of fine watchmaking. From the intricately designed lunar disc to the workings of the mechanical movement, these watches epitomize attention to detail.
Visual Appeal
Whether you prefer a minimalist or ornate design, the visual allure of tracking the moon's phases can add a sophisticated and unique edge to your personal style.
Conversation Starter
Few watches carry stories as rich as the ‘Behrens Constell’ moon phase wrist watch. Sharing the detail of how it mimics the elegant lunar cycle can spark curiosity and awe among friends and fellow watch enthusiasts.
Function Meets Art
With advancements in technology, many moon phase watches now feature innovations like sapphire crystal, making them both durable and stunningly elegant.
Affordability
While some moon phase wrist watches cater to luxury tastes, there are also affordable mechanical watches available today, offering this exquisite complication at a more accessible price point.
Where to Find the Best Moon Phase Watches?
Aspiring to own a moon phase watch involves more than just functionality; it’s about investing in quality and legacy. Reputable brands specialize in original watches that masterfully blend craftsmanship with innovation. For affordable yet premium options, explore Behrens' affordable mechanical watches. Their designs are carefully crafted to offer elegance paired with durability, making them suitable for both everyday wear and special occasions.
When browsing, be sure to look into models featuring sapphire crystal, showcasing both durability and refined aesthetics. Internal links, like Behrens' collections, can provide a deeper understanding of their variety of mechanical watches and their impressive self-winding counterparts.

A Final Word on Behrens Original Series
Behrens prides itself on creating precision-engineered mechanical watches that celebrate timeless artistry. The Behrens Original series encapsulates everything you love about a moon phase wrist watch––innovative design, superior mechanics, and breathtaking details. Each watch is a masterpiece, combining functionality and beauty in a way only true artisans can achieve. If you're seeking an automatic mechanical watch with truly original craftsmanship, the Behrens collections are worth exploring.
Whether you're a seasoned watch collector or just beginning your horological journey, a moon phase watch offers you more than the time––it offers a connection to both Earth's ancient rhythm and the craftsmanship of fine watchmaking. Explore now and find the perfect timepieces to complement your passion for avant garde and mechanically brilliant detail.