Richard Lange Perpetual Calendar “Terraluna” meets many benchmarks set by Lange in terms of accuracy, innovation and design aesthetics, and is another important work Lange brings to the field of precision watchmaking. . This watch is equipped with trajectory moon phase display, perpetual calendar with Lange large calendar display, 14-day power reserve and constant power escapement system, which is the pinnacle of Saxony’s watchmaking technology.
The circular design of the time display and the perpetual calendar window are the characteristics of RICHARD LANGE PERPETUAL CALENDAR ‘Terraluna’.
Regardless of the surface or the bottom cover, Richard Lange Perpetual Calendar ‘Terraluna’ is equally stunning. The front of its 45.5mm 18K rose gold or white 18K gold case showcases the timepiece layout unique to scientific precision watches. On the side of the movement, you can see the latest achievements of Lange’s creativity: the moon phase display depicting the trajectory of the earth, the moon and the sun constellation.
Three lap time display
A large minute ring is placed on top of the Richard Lange Perpetual Calendar “Terraluna” dial. Hours and seconds are set on the right and left, respectively. Just like the Richard Lange Tourbillon “Pour le Mérite” launched in 2011, the design of the dial was inspired by a historical masterpiece, that is, the whole time created by Johann Heinrich Seyffert in 1807 The device is now in the mathematical physics salon of the world-renowned Zwinger Palace in Dresden. With this ingenious design, Safefert made Dresden, a famous city in Saxony, a precision watch hub in the early 19th century. This timepiece pattern is a great advantage of precision pocket watches. Its accuracy has not only won praise from timekeeping service agencies and observatories, but also has been favored by many watch factories and has become an authoritative reference for adjusting new timepieces.
Four timeless windows
Below the unique Lange large calendar display (this device was first seen in the Richard Lange watch series), there are small windows on the left and right sides of the week and month respectively. This arrangement makes the calendar display clear at a glance. The perpetual calendar device is set by a mechanical program, which can correctly display the different days of each year in the whole year and in each month of the leap year. No adjustment is required until 2100 years ago. The leap year display is set in a small round window to the right of the number ’15’ in the minute circle. All calendar displays can be advanced instantly, ensuring that the displays are clear at all times. To ensure that the required force is minimized during the switching process, the energy is gradually stored by the rotation of the cam and then released at midnight.
Moon on track
Through the side of the movement, you can see the patent-pending trajectory moon phase display. This innovative technology device, which was first installed in the watch, shows the position of the moon relative to the earth and the sun. The orbital moon phase display consists of three disks. On a star-studded celestial disk, the moon is exposed in a circular window, and it rotates counterclockwise around the earth’s orbit once a month. This device accurately weights the existing moon days of 29 days, 12 hours, 44 minutes and 3 seconds, and it is not necessary to correct one day after 1058. Below it is a rotating moon phase disk with two new moons. The phase of the moon can be observed through the window of the celestial disc. In the constellation chart, the balance wheel represents the position of the sun. On the new moon, the dark moon will appear between the earth and the sun. On the other side of the earth is a full moon day, showing a bright moon. Therefore, the moon’s position and phase will be presented at the same time. The earth set at the center of the display rotates around the earth axis once a day. The side facing the sun or balance wheel is day and the other side is night. The outer 24-hour scale is used as a reference to the time in the northern hemisphere.
The Lange watch factory produces its own model L096.1 movement, which depicts the trajectory of the earth, moon and sun.
In terms of accuracy, Lange product developers not only focus on the structure of the moon phase display device with three solid white 18K gold discs, the design is also the focus. In order to clearly and beautifully display the image of the trajectory moon phase display, the researchers adopted special coating technology. For example, the interference effect of overlapping light waves on a celestial disc can absorb all the non-blue spectrum of incident light, and finally form a dark blue surface, which is in sharp contrast to the form of over a thousand well-defined stars.
The moon orbits the earth counterclockwise, left to right: new moon, first quarter moon, full moon, second quarter moon
Two weeks constant power
Equipped with two sturdy mainspring dual barrels, providing 14 days power reserve. Because the barrel is capable of storing powerful power, in order to ensure that the watch maintains a stable rate throughout the power reserve, it must be controlled using specialized technology. Normally, a fully wound mainspring will release excessive torque directly to the wheel train when it is running, and when the mainspring is close to the unwinded state, its torque will decrease accordingly, which affects the accuracy of the watch. A refined constant dynamic escapement system can make up for these two shortcomings. This system releases the same amount of available power to the balance wheel every 10 seconds, thereby ensuring that the torque is maintained. In this way, the amplitude is fixed from the first day to the last day, and it is accurate and reliable. The circular power reserve indicator, set at 6 o’clock, reminds the watch owner to inject new energy into the movement by winding the crown at an appropriate time.
Pursuing the highest accuracy
Lange has been one of the few watch factories that has mastered the production technology of balance springs since 2003. Only in this way can the brand ensure the highest level of precision in its movements. Therefore, in addition to the balance spring, in the new L096.1 self-made movement of Richard Lange Perpetual Calendar ‘Terraluna’, the center-mounted permanent spring of the constant power escapement system is also manufactured by the watch factory itself. The vibration frequency of its pointerless oscillation system is 21,600 times per hour. Other Lange-style quality signs include hand-carved balance wheel splints and exquisite hand-decorated movements. These details reflect the meticulous spirit of the watch factory.