MOON PHASE WATCHES

MOON-PHASE DISPLAYS

Most of our moon-phase displays reproduce the moon’s orbit with a precision of 99.998 per cent, so if the watch runs uninterrupted, it needs to be adjusted only after 122.6 years – and even then only by one day. 

ACCURATE TO 99.998 PER CENT

Since the dawn of humanity, people have been looking to a very special celestial body when it comes to measuring periods of time: the moon. Its regular rhythm can be easily tracked, and for thousands of years, it has been the foundation on which our calendar is subdivided into weeks and months. A. Lange & Söhne’s watchmakers are also fascinated by the earth’s satellite. To such a degree, in fact, that they leverage all the potentials of mechanical precision to emulate its orbit with extreme accuracy and reproduce its radiance as brilliantly as possible.

PRECISION IN DETAIL

Most of our moon-phase displays are 99.998 per cent accurate, so if the watch runs without interruption, a correction by one day is only needed when 122.6 years have elapsed. This is achieved with an ingenious mechanical transmission that steps down the rotation of the hour wheel. But Lange’s product developers have demonstrated that precision can be further enhanced: The mechanism of the patented orbital moon-phase display of the RICHARD LANGE PERPETUAL CALENDAR “Terraluna” is calculated with such accuracy that if the watch runs without interruption, it will take 1058 years before a correction by one day is required.

Movement L096.1 of the RICHARD LANGE PERPETUAL CALENDAR Terraluna

THE MOON-PHASE DISPLAY

BRIGHT BRILLIANCE

The rich blue hue is another special facet of Lange lunar discs. The unique chromatic effect is achieved by superposing light waves. To produce this so-called interference phenomenon, Lange has partnered with scientists to develop a patented coating process for the solid-gold discs. The vibrant blue tint forms a remarkably high-contrast backdrop for the stars. In the RICHARD LANGE PERPETUAL CALENDAR “Terraluna”, more than two thousand stars in five different sizes emphasise the fascination of the night sky.

A MOON FOR DAYS AND NIGHTS

Presented in 2016, the newly conceived moon-phase display of the LANGE 1 MOON PHASE with a day/night indicator always presents the moon against a realistic depiction of the sky. This is achieved with a two-part design. A celestial disc that rotates clockwise once every 24 hours forms the backdrop for the lunar orbit. On the celestial disc, the different times of day are represented by varying blue hues based on interference effects. During the day, the sky is bright blue without stars, but gradually becomes darker as the afternoon progresses. At night, the sky is dark blue and studded with a multitude of stars.

THE MOON PHASE DISPLAY WITH DAY/NIGHT INDICATION

THE ORBITAL MOON-PHASE DISPLAY

In the RICHARD LANGE PERPETUAL CALENDAR “Terraluna”, the depiction of the moon phases also by far transcends the classic notion of precision by incorporating the surroundings of the earth’s companion. The patented orbital moon-phase display shows the current moon phase as well as the positions of the moon and sun as an observer in the northern hemisphere would see them. The display is composed of the celestial disc, the lunar disc which lies beneath it, and the earth disc in the centre. The position of the sun is defined by the balance. The moon can be seen through a round aperture in the celestial disc. It orbits the earth once in the anti-clockwise direction in slightly more than 29.5 days. A gear train assures that the moon phase is always accurately rendered.

In the centre of the celestial disc, the earth disc rotates through 360 degrees once a day. It is daytime on the half that faces the sun (the balance) and nighttime on the other. The circumferential 24-hour scale provides a time-of-day reference for regions in the northern hemisphere.

COMPLICATIONS

OUTSIZE DATE
OUTSIZE DATE
The A. Lange & Söhne outsize date enables a date display with digits around three times as large as those in watches of comparable dimensions.
CHRONOGRAPH
CHRONOGRAPH
Chronographs and their manufacture movements have been flagship products of A. Lange & Söhne since 1999.
CALENDAR FUNCTION
CALENDAR FUNCTION
Lange models incorporate either annual calendars or perpetual calendars.
MOON-PHASE DISPLAY
MOON-PHASE DISPLAY
Most of our moon-phase displays reproduce the moon’s orbit with a precision of 99.998 per cent.
POWER-RESERVE INDICATOR
POWER-RESERVE INDICATOR
The UP/DOWN display reminds the owner to rewind the watch before it stops running.
TOURBILLON WATCHES
TOURBILLON WATCHES
The tourbillon improves the rate accuracy of a mechanical timepiece by overcoming the influence of gravity on the running of a watch.
THE FUSÉE-AND-CHAIN TRANSMISSION
THE FUSÉE-AND-CHAIN TRANSMISSION
The fusée-and-chain transmission is one of the most effective complications when it comes to increasing the rate accuracy of a mechanical watch.
CONSTANT-FORCE ESCAPEMENT
CONSTANT-FORCE ESCAPEMENT
The purpose of a constant-force escapement in a mechanical watch is to provide the escapement with a consistent flow of power, regardless of whether the watch is fully wound or nearly unwound.
CHIMING MECHANISM
CHIMING MECHANISM
Chiming mechanisms make it possible to hear the time.

EXPLORE FURTHER

FINISHING AND ENGRAVING
FINISHING AND ENGRAVING
Even the most minute pieces undergo an elaborate finishing.
THREE-QUARTER PLATE
THREE-QUARTER PLATE
The three-quarter plate that dates back to Ferdinand Adolph Lange ranks among the typical hallmarks of A. Lange & Söhne timepieces.
TWOFOLD ASSEMBLY
TWOFOLD ASSEMBLY
Be it a simple model or a highly sophisticated timepiece – at A. Lange & Söhne, every movement is assembled twice.
THE LANGE 1 FAMILY

THE LANGE 1 FAMILY

THE LEGEND AMONG LANGE TIMEPIECES

The LANGE 1 is the result of a bold new beginning. It combines tradition and innovation and is regarded as the epitome of Lange watchmaking artistry.

DISCOVER A. LANGE & SÖHNE TIMEPIECES

Crafted by hand in Glashütte, Germany.

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HOW CAN WE BE OF SERVICE?

Whether you are in search of a specific model, have questions out of interest or need a service request for your timepiece – we are delighted to help you. We are at your service by phone, email or in one of our boutiques. 

The A. Lange & Söhne salon in Geneva