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Patek Philippe Perpetual Calendar 5320G-001 Very good White gold 40mm Automatic United States of America, New York, New York
TOP
Patek Philippe Ref 5320G-001 Perpetual Calendar, Unworn
$69,900
Verified Dealer
9
US
Patek Philippe Perpetual Calendar Chronograph 5004R Very good Rose gold 37mm Manual winding United States of America, New York, New York
TOP
Patek Philippe 5004R-014 Perpetual Split Chronograph, Complete...
$259,000
Verified Dealer
9
US
Patek Philippe Nautilus 5712R Very good Rose gold 40mm Automatic United States of America, New York, New York
TOP
Patek Philippe Nautilus
$74,800
Verified Dealer
296
US
Patek Philippe Annual Calendar 5205R-001 Very good Rose gold 40mm Automatic United States of America, Florida, Boca Raton
TOP
Patek Philippe 5205R Annual Calendar White Dial Watch with Box...
$37,950
Free shipping
Verified Dealer
US
Patek Philippe Perpetual Calendar Chronograph 5004J Very good Yellow gold 37MMmm Manual winding United States of America, Massachusetts, Boston
Patek Philippe 5004J Perpetual Calendar Split Second Chronogra...
$200,000
Verified Dealer
27
US
Patek Philippe Nautilus 5726A Very good Steel 40.5mm Automatic United States of America, New Hampshire, Nashua
TOP
Patek Philippe stainless steel Nautilus Maker: Rolex Model:...
$55,000
Verified Dealer
156
US
Patek Philippe Annual Calendar 4936G-001 Very good White gold 37mm Automatic United States of America, Florida, Aventura
Patek Philippe Complications Annual Calendar 4936G
$29,500
Verified Dealer
217
US
Hublot Big Bang Unico 406.JX.0120.RT Very good 45mm Automatic United States of America, Pennsylvania, Bala Cynwyd
TOP
Hublot Big Bang Unico Perpetual Calendar 406.JX.0120.RT
$74,950
Free shipping
Verified Dealer
1159
US
A. Lange & Söhne Datograph 410.025 Very good Platinum 41mm Manual winding United States of America, California, Irvine
A. Lange & Söhne Datograph Perpetual Calendar
$82,895
Verified Dealer
11
US
Patek Philippe Annual Calendar 5205R-010 New Rose gold 40mm Automatic United States of America, New York, New York
Patek Philippe Annual Calendar 5205R-010
$42,999
Free shipping
Verified Dealer
65
US
IWC Portofino Hand-Wound IW516401 New Steel 45mm Manual winding United States of America, New York, New York
TOP
IWC PORTOFINO HAND-WOUND MOON PHASE IW516401
$11,500
Free shipping
Verified Dealer
704
US
Omega Speedmaster Professional Moonwatch Moonphase 304.63.44.52.02.001 New Yellow gold Automatic United States of America, Florida, Hollywood
TOP
Omega Moonphase Speedmaster 304.63.44.52.02.001 Yellow Gold...
$20,985
Verified Dealer
763
US
Hublot Classic Fusion Aerofusion 517.OX.0180.LR New Rose gold 45mm Automatic United States of America, New Jersey, Englewood
Hublot Classic Fusion Aerofusion Moonphase - 517.OX.0180.LR
$24,563
Verified Dealer
18
US
A. Lange & Söhne Saxonia 384.032 Unworn Rose gold 40mm Automatic United States of America, Massachusetts, Boston
A. Lange & Söhne Saxonia Moonphase Rose Gold 40mm (384.032)
$24,000
Verified Dealer
27
US
Patek Philippe Perpetual Calendar 5039J Very good Yellow gold 35.2mm Automatic United States of America, New Hampshire, Nashua
TOP
Patek Philippe 18k yellow gold Perpetual Calendar Maker: Patek...
$38,000
Verified Dealer
156
US
Patek Philippe Nautilus 5726A-001 Very good Steel 40.5mm United States of America, New York, New York
Patek Philippe Nautilus
$58,500
Verified Dealer
9
US
Mathey-Tissot Very good Yellow gold 38mm Manual winding United States of America, New York, New York
Mathey-Tissot Triple calendar Moonphase
$7,950
Free shipping
Verified Dealer
17
US
A. Lange & Söhne Saxonia 384.026 Very good White gold 40mm Automatic United States of America, California, Irvine
A. Lange & Söhne Saxonia
$22,895
Verified Dealer
11
US
Patek Philippe Perpetual Calendar Chronograph 5270R-001 Very good Rose gold 41mm Manual winding United States of America, New York, New York
Patek Philippe Grand Complications Perpetual Chronograph...
$124,999
Free shipping
Verified Dealer
65
US
Patek Philippe Annual Calendar 5150J New Yellow gold 36mm Automatic United States of America, New York, Brooklyn
Patek Philippe 5150J - T150 Annual Calendar Tiffany / LIMITED...
$55,000
Free shipping
Verified Dealer
 
US
Rolex Cellini Moonphase 50535 Unworn Rose gold 39mm Automatic United States of America, New York, New York
Rolex Cellini Moonphase 50535 18K Everose Gold Complete Unworn
$23,000
Free shipping
Verified Dealer
37
US
Blancpain Villeret Quantième Complet 6639a-3631-55b Unworn Rose gold 42mm Automatic United States of America, New Jersey, Englewood
Blancpain Villeret Complete Calendar 8 Days - 6639a-3631-55b
$31,425
Verified Dealer
18
US
Patek Philippe Annual Calendar Patek Philippe 5036/1R Very good Rose gold Automatic United States of America, Massachusetts, Boston
Patek Philippe Annual Calendar Moon Phase Rose Gold 37mm...
$42,500
Verified Dealer
27
US
Blancpain Villeret Quantième Complet 6263 Good Steel 37.6mm Automatic United States of America, Florida, Sarasota
TOP
Blancpain Villeret Moonphase & Complete Calendar 37.6mm...
$5,640
Free shipping
Verified Dealer
747
US
Omega Speedmaster Professional Moonwatch Moonphase 304.33.44.52.03.001 Very good Steel Automatic United States of America, Florida, Miami
Omega Speedmaster Professional Moonwatch Moonphase
$7,000
Free shipping
Verified Dealer
17
US
Vacheron Constantin Patrimony 30020 Very good Yellow gold Manual winding United States of America, Massachusetts, Boston
Vacheron Constantin Patrimony 30020 Minute Repeater Perpetual...
$148,500
Verified Dealer
603
US
A. Lange & Söhne 1815 231.035 Very good Platinum 36mm Manual winding United States of America, California, Irvine
A. Lange & Söhne 1815
$38,895
Verified Dealer
11
US
Audemars Piguet Royal Oak Perpetual Calendar 26574ST.OO.1220ST.01 Very good Steel 41mm Automatic United States of America, New York, New York
Audemars Piguet Royal Oak Perpetual Calendar Steel 26574ST.OO....
$65,000
Free shipping
Verified Dealer
65
US
Patek Philippe Perpetual Calendar Chronograph 5004P Very good Platinum 36.5mm Manual winding United States of America, New York, New York City
TOP
Patek Philippe Perpetual Calendar Chronograph 5004P-001
$295,000
Private Seller
 
US
Rolex Cellini Moonphase 50535 Very good Rose gold 39mm Automatic United States of America, New York, New York
TOP
Rolex Cellini Moonphase
$20,495
Free shipping
Verified Dealer
410
US
Jaquet-Droz Astrale J012633203 New Rose gold 43mm Automatic United States of America, New Jersey, Englewood
Jaquet-Droz Astrale Eclipse 43mm - J012633203
$20,500
Verified Dealer
18
US
A. Lange & Söhne 1815 238.026 Unworn White gold 40mm Manual winding United States of America, Massachusetts, Boston
A. Lange & Söhne 1815 Annual Calendar White Gold 40mm (238.026)
$34,000
Verified Dealer
27
US
Vacheron Constantin Malte 47212/000P-9250 New Platinum 42mm Manual winding United States of America, California, Beverly Hills
Vacheron Constantin Malte Perpetual Calendar Platinum Chrono
$89,500
Verified Dealer
107
US
Rolex 8171 Very good Steel 38mm Automatic
TOP
Rolex Perpetual Padellone 8171 Service Official Rolex Full Set
Price on request
Verified Dealer
298
IT
Patek Philippe Annual Calendar 5146G Very good White gold 39mm Automatic United States of America, Massachusetts, Boston
Patek Philippe Annual Calendar 5146G 18K White Gold (35348)
$29,500
Verified Dealer
603
US
A. Lange & Söhne Saxonia 330.032 Very good Rose gold 38.5mm Automatic United States of America, California, Irvine
A. Lange & Söhne Saxonia Annual Calendar Rose Gold
$32,395
Verified Dealer
11
US
Audemars Piguet Royal Oak Offshore Chronograph 25854TI.OO.1150TI.01 Very good Titanium 44mm Automatic United States of America, New York, New York
Audemars Piguet Royal Oak Offshore Perpetual Calendar Chronogr...
$34,999
Free shipping
Verified Dealer
65
US
Jaeger-LeCoultre Master Ultra Thin Moon 1368420 Very good Steel 39mm Automatic United States of America, Illinois, Chicago
TOP
Jaeger-LeCoultre Master Ultra Thin Moon
$7,490
Private Seller
 
US
Patek Philippe Nautilus 5712/1A-001 Unworn Steel 40mm Automatic United States of America, New York, Westchester
Patek Philippe Nautilus
$69,900
Verified Dealer
 
US
Breguet Classique 7337bb1e9v6 Unworn White gold 39mm Automatic United States of America, New Jersey, Englewood
Breguet Classique Day Date Moonphase - 7337bb1e9v6
$27,930
Verified Dealer
18
US
Patek Philippe Annual Calendar 5396/1G-010 Very good White gold 38.5mm Automatic United States of America, Massachusetts, Boston
Patek Philippe Calatrava Annual Calendar Opaline Dial White...
$47,500
Verified Dealer
27
US
Patek Philippe Perpetual Calendar Chronograph 3970E Good Yellow gold 36mm Manual winding United States of America, California, Beverly Hills
Patek Philippe Perpetual Calendar Chronograph
$89,500
Verified Dealer
107
US
Patek Philippe Nautilus 5712R-001 Unworn Rose gold 40mm Automatic United States of America, New York, New York
Patek Philippe Nautilus 18K Rose Gold Moon Phase Complete and...
$72,000
Free shipping
Verified Dealer
37
US
Audemars Piguet Royal Oak Day-Date 25594 Very good Yellow gold 36mm Automatic United States of America, Massachusetts, Boston
Audemars Piguet Royal Oak 25594 Day Date Moon 18K Yellow Gold...
$29,900
Verified Dealer
603
US
A. Lange & Söhne 1815 421.025FE Very good Platinum 41.9mm Manual winding United States of America, California, Irvine
A. Lange & Söhne 1815 Rattrapante Perpetual Calendar
$164,895
Verified Dealer
11
US
Patek Philippe Nautilus 5712G-001 New White gold 40mm Automatic United States of America, New York, New York
Patek Philippe Nautilus Selfwinding 5712G NEW 2020
Price on request
Free shipping
Verified Dealer
65
US
Pierre Kunz Very good Titanium 41mm Automatic United States of America, New York, New York
Pierre Kunz Spirit of Challenge
Price on request
Free shipping
Verified Dealer
17
US
Maurice Lacroix Masterpiece Phases de Lune MP6528-SS001-430 Good Steel 43mm Automatic United States of America, Florida, Sarasota
TOP
Maurice Lacroix Masterpiece Lune Retrograde Automatic Blue...
$3,000
Free shipping
Verified Dealer
747
US
Harry Winston Premier PRNQMP36RR001 New Rose gold 36mm Quartz United States of America, New Jersey, Englewood
Harry Winston Premier Moon Phase - PRNQMP36RR001
$21,000
Verified Dealer
18
US
Blancpain Villeret Quantième Complet 6654-1113-55B Unworn Steel 40mm Automatic United States of America, Massachusetts, Boston
Blancpain Villeret Quantieme Moonphase Complete Calendar...
$9,900
Verified Dealer
27
US
Patek Philippe Perpetual Calendar Chronograph 5204/1R-001 New Rose gold 40mm Manual winding United States of America, California, Beverly Hills
Patek Philippe Perpetual Calendar Split Chronograph
$239,500
Verified Dealer
107
US
Patek Philippe Celestial 5102G-001 Unworn White gold 43mm Automatic United States of America, California, Beverly Hills
Patek Philippe White Gold Celestial Watch Ref. 5102, Unworn
$195,000
Verified Dealer
65
US
Patek Philippe Perpetual Calendar 34837 Very good Yellow gold 37mm Automatic United States of America, Massachusetts, Boston
Patek Philippe Perpetual Calendar / 18K Yellow Gold Bracelet...
$48,900
Verified Dealer
603
US
Patek Philippe Perpetual Calendar Chronograph 5270G-019 Unworn White gold 41mm Manual winding United States of America, Iowa, Des Moines
Patek Philippe Perpetual Calendar Chronograph 41mm Blue 5270g-001
$141,000
Free shipping
Verified Dealer
1318
US
5146G-001 New White gold 39mm Automatic United States of America, New York, New York
Patek Philippe Complications Moon Phases Annual Calendar 5146G...
$36,199
Free shipping
Verified Dealer
65
US
Elgin 4820 Good Yellow gold 32mm Manual winding United States of America, North Carolina, Durham
TOP
Elgin (Lord) 1950's Wakefield 14kt (S&W)
$323
Private Seller
 
US
Baume & Mercier Clifton MOA10055 New Steel 43mm Automatic United States of America, Florida, Sarasota
TOP
Baume & Mercier Clifton Triple-Date Moonphase Mens 43mm...
$2,726
Free shipping
Verified Dealer
747
US
Omega Speedmaster Professional Moonwatch Moonphase 3575.20.00 Very good Steel 42mm Manual winding United States of America, California, Santa Monica
Omega Speedmaster Moonphase
$4,700
Verified Dealer
79
US
Patek Philippe Perpetual Calendar 5040G Very good White gold Automatic United States of America, Massachusetts, Boston
Patek Philippe Perpetual Calendar White Gold Tonneau Case ref....
$38,000
Verified Dealer
27
US
Patek Philippe Nautilus 5726A-001 Fair Steel 40.5mm Automatic United States of America, California, Beverly Hills
Patek Philippe Nautilus
$52,950
Verified Dealer
107
US
Patek Philippe Perpetual Calendar Chronograph 5204P-011 Very good Platinum 40mm Manual winding United States of America, California, Beverly Hills
Patek Philippe Platinum Perpetual Split Seconds Chrono Watch...
$270,000
Verified Dealer
65
US
A. Lange & Söhne 1815 238.032 Very good Rose gold Manual winding United States of America, Massachusetts, Boston
A. Lange & Söhne 1815 Annual Calendar 238.032 18k Rose Gold...
$33,500
Verified Dealer
603
US
Very good Steel 45mm Automatic United States of America, Florida, Miami
Sarpaneva Korona K3
$17,500
Free shipping
Verified Dealer
17
US
Patek Philippe Annual Calendar 5205G-013 New White gold 40mm Automatic United States of America, New York, New York
Patek Philippe Annual Calendar 5205G-013
$45,999
Free shipping
Verified Dealer
65
US

Moon Phase Watches: Under the Lunar Spell

Humans have always had a fascination with the Moon. The first moon phase watches appeared back in the 1500s. A few modern pieces will accurately display the Moon's phase for over 2 million years and mark the pinnacle of haute horlogerie.


5 Reasons to Buy a Moon Phase Watch

  • One of the most popular complications
  • Prices beginning under 1,100 USD
  • Top models often feature a perpetual calendar
  • Andreas Strehler: A record-breaking moon phase, accurate for 2 million years
  • Luxury timepieces from A. Lange & Söhne and Patek Philippe

A Moon Phase for Every Budget

It takes the Moon 29 days, 12 hours, 44 minutes, and 3 seconds to complete one full cycle. During that time, it goes through four major phases: New Moon, Waxing Moon, Full Moon, and Waning Moon. A moon phase display makes it easy to keep track of the Moon's current stage in the cycle and is one of the most popular complications. However, it's actually not as complex as it might sound.

Numerous manufacturers produce moon phase watches, covering a wide price range. The most affordable models start at less than 1,100 USD, while more exclusive timepieces can cost upwards of 110,000 USD. Watches on the upper end of the price range often feature a unique moon phase mechanism and perpetual calendar. One prominent example is the Richard Lange Perpetual Calendar Terraluna from A. Lange & Söhne. This model has an orbital moon phase display on the reverse side of its case. Thanks to its intricate mechanics, this display only requires manual correction every 1,058 years. More conventional moon phase displays tend to deviate by about eight hours per year, meaning they will be off by one full day after three years. Of course, all this technical mastery has its price: the Richard Lange Perpetual Calendar Terraluna costs around 178,000 USD in red or white gold.

The record for the world's most precise moon phase watch belongs to Andreas Strehler and his Sauterelle à lune perpétuelle. This timepiece's astounding moon phase display only deviates by one day every 2.06 million years. Strehler's Sauterelle à heure mondiale takes his extraordinary moon phase mechanism and adds a world time function that sits on the case back and displays the time in 24 time zones simultaneously. You can call the Sauterelle à heure mondiale your own for around 125,000 USD (excluding VAT). The Sauterelle à lune perpétuelle costs about 98,000 USD in red gold and 113,000 USD in platinum, also excluding VAT.


How much do moon phase watches cost?

Model Price (approx.) Other functions
Glycine Combat Classic Moonphase 1,100 USD Date
Oris Artelier Complication 1,600 USD Date, day, second time zone
Mido Baroncelli Moon Phase 1,800 USD Chronograph, calendar
Maurice Lacroix Les Classiques Moonphase 2,200 USD Pointer date
Frederique Constant Slimline Moonphase Manufacture 2,800 USD Pointer date
Longines Master Collection 3,000 USD 24-hour display and retrograde small seconds, date, and day displays
Patek Philippe ref. 5205 42,500 USD Annual calendar, 24-hour display
A. Lange & Söhne Grand Lange 1 Moonphase "Lumen" 78,000 USD Oversize date, luminous displays

Prices for Affordable Models

Moon phase watches don't have to cost an arm and a leg, as demonstrated by Swiss manufacturers like Glycine, Maurice Lacroix, and Mido. Glycine's Combat Classic Moonphase is among the most affordable models and costs under 1,100 USD, even with gold plating. The automatic caliber GL280 powers this timepiece and provides it with its date display.

You can save even more by purchasing a moon phase watch with a quartz caliber. For example, the 41-mm Certina DS-8 Moon Phase goes for under 560 USD in mint condition. The version with a chronograph function for measuring periods of time sells for about 670 USD. At the very bottom of the price range, you'll find quartz watches from Casio, Jacques Lemans, or Henry that only cost around 170 USD.

Overview: Affordable Moon Phase Watches

  • Under 1,100 USD: Glycine Combat Classic Moonphase with an automatic caliber
  • Under 560 USD: Certina DS-8 Moon Phase with a quartz movement
  • Around 170 USD: Quartz watches from Casio or Jacques Lemans

Mid-Range Moon Phase Watches

Maurice Lacroix, Mido, Frederique Constant, and Longines all produce relatively inexpensive moon phase watches. Each of these brands is famous for crafting high-quality mechanical timepieces that offer fantastic value for money.

The Genevan brand Frederique Constant is synonymous with affordable luxury and classically elegant designs. Their Slimline Moonphase Manufacture model with a pointer date has a 42-mm stainless steel case and costs as little as 2,800 USD. At only 2,200 USD, pre-owned pieces are even more budget-friendly. The rose gold edition falls in a similar price range. Frederique Constant also produces the Slimline Perpetual Calendar Manufacture, one of the most affordable perpetual calendars in the industry. The gold-plated version changes hands for roughly 7,800 USD.

Swiss manufacturer Maurice Lacroix also produces economical moon phase watches. One example is the 40-mm Les Classiques Moonphase with a pointer date. This stainless steel timepiece comes on a leather strap or stainless steel bracelet. With a price tag of about 2,200 USD, new pieces are remarkably affordable.

A never-worn Oris Artelier Complication requires an investment of around 1,600 USD. If you're lucky, you might even find a pre-owned piece selling for less than 1,100 USD. This dress watch features a day-date display and a second time zone in addition to a moon phase display. Oris outfits this timepiece with the caliber 781, which is based on the Sellita SW 200-1.

An Overview of Mid-Range Moon Phase Watches

  • Under 1,700 USD: Oris Artelier Complication
  • Around 2,200 USD: Maurice Lacroix Les Classiques Moonphase
  • Around 2,800 USD: Frederique Constant Slimline Moonphase Manufacture

Mido and Longines Models with a Chronograph and Calendar

Both Longines and Mido belong to the Swatch Group and combine moon phase displays with chronographs and calendars. The Valjoux 7751 ticks away inside these timepieces. It has a dual 12-hour counter and moon phase display at 6 o'clock and a combined 24-hour display and small seconds at 9. The day and month displays are integrated into the 30-minute counter at 12. There's also an additional central hand that points to the date around the dial's edge.

The Mido Baroncelli Moon Phase comes in stainless steel or with a rose gold PVD coating. You also can choose between a leather strap or stainless steel bracelet. Plan to spend around 1,800 USD on this Mido moon phase watch in mint condition. The model with a PVD coating demands some 2,100 USD new.

Longines offers a comparable chronograph in their Master Collection. This classic watch boasts a moon phase display, calendar, and stopwatch function. At about 2,700 USD, a never-worn Longines model is a bit more expensive than its Mido counterpart. However, pre-owned pieces sell for only 1,900 USD.

Longines' catalog also contains a moon phase watch with four retrograde displays: a small seconds, a pointer date, a second time zone, and a day display. Each display has a pointer that returns to its starting position once it reaches the end of the scale. Longines equips this timepiece with the caliber L707, based on the ETA A07.L31. This movement has a 48-hour power reserve and ticks at 28,800 alternations per hour. You can call this watch your own for under 2,200 USD pre-owned and approximately 3,000 USD new.


High-End Moon Phase Watches

Timepieces from Patek Philippe and A. Lange & Söhne represent the crème de la crème of watchmaking. Patek Philippe has had a reputation for crafting exquisite timepieces for over 180 years. The company is more than familiar with the moon phase function and often combines it with an annual calendar in the watches of their Complications collection. Annual calendars only require manual correction once a year.

The Patek ref. 5205 also features a 24-hour display. This luxury watch's calendar function occupies three windows: There's the day at 10, date at 12, and month at 2 o'clock. Rose gold editions tend to cost around 42,500 USD, regardless of condition. The ref. 5396 also boasts an annual calendar and 24-hour display. Its date display sits at 6 o'clock, while the day and month are located on the dial's upper half. This timepiece requires an investment of about 41,000 USD new and 35,000 USD pre-owned. Finally, the ref. 5146 comes with an annual calendar but lacks a 24-hour display. It uses subdials for the month and day displays. The yellow gold version sells for between 25,000 and 34,000 USD.

The Lange 1 was A. Lange & Söhne's first wristwatch and has since come to define this German luxury watch manufacturer. Off-center displays and an outsize date characterize this timepiece. Over time, the Lange 1 has developed into a comprehensive collection of watches. Highlights include timepieces with a perpetual calendar, tourbillon, and/or moon phase. Of the moon phase watches, the Grand Lange 1 Moon Phase "Lumen" sets itself apart with its translucent dial. It allows through just enough light to energize the watch's luminous elements, such as its outsize date and moon phase display. What's more, this particular Lange 1 was A. Lange & Söhne's first wristwatch to feature glow-in-the-dark components. Be sure to have around 78,000 USD on hand for a mint-condition model.

The Grand Lange 1 Moon Phase and Lange 1 Moon Phase both have more classic designs than the "Lumen." Furthermore, the 38.5 and 41-mm editions are much more affordable than their luminescent counterpart. All three of these moon phase watches share the same manual in-house caliber with a 72-hour power reserve. This movement's moon phase display has to be corrected by hand every 122.6 years . You can purchase a never-worn Lange 1 Moon Phase in white gold for roughly 35,000 USD. Pre-owned pieces change hands for some 31,000 USD. Prices for the rose gold edition range from 20,500 to 33,500 USD, depending on its condition. If you prefer platinum watches, take a look at the Grand Lange 1 Moon Phase. This model costs about 46,000 USD new and 43,000 USD pre-owned.

Moon Phase Watches from A. Lange & Söhne and Patek Philippe

  • Around 33,000 USD: A. Lange & Söhne Lange 1 Moon Phase
  • Around 42,000 USD: Patek Philippe ref. 5205
  • Around 78,000 USD: A. Lange & Söhne Grand Lange 1 Moon Phase "Lumen"

How do moon phase watches work?

Moon phase watches essentially function like any other mechanical watch. However, unlike conventional three-hand models, these timepieces feature a moon phase display, often in the form of a disc. The disc sits below a semicircular opening and has two moons, only one of which is visible at any given time. Watch manufacturers use two moons instead of one because a complete lunar cycle lasts 29.5 days. Since there is no gear with 29.5 teeth, they use a gear with 59 teeth . Each day, the watch movement moves this gear forward by one tooth, thus completing two whole cycles per full rotation. This process usually takes place around midnight and is often linked to the date display.

This is the simplest of all moon phase displays, and it has an annual deviation of eight hours. This means it will be a full day off after three years. This is a result of the fact that an actual lunar cycle is 44 minutes and 3 seconds longer than the 29.5-day system employed by these mechanisms.

The Moon's individual phases are determined by its orbit around the Earth and its position relative to our planet and the Sun. If the Sun is shining on the Earth-facing side, we see a Full Moon. If it's shining on the opposite side, the Moon seems to disappear. This is known as a New Moon. The Moon and Earth rotate at the same rate, which is why we only ever see one side of the Moon from Earth.


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