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RICHARD LANGE PERPETUAL CALENDAR "Terraluna"

The exact journey of the moon around the earth

As long as the RICHARD LANGE PERPETUAL CALENDAR “Terraluna” is worn, it reveals nothing about the moon because its patented orbital moon-phase display can only be admired through the sapphire-crystal caseback of the watch. It 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. Once correctly set, the moon-phase display is so precise that if the watch runs without interruption, it will take 1058 years before a correction by one day is required.

The regulator dial of the RICHARD LANGE PERPETUAL CALENDAR “Terraluna” is home not only to hours, minutes and seconds. It also houses four precisely jumping perpetual calendar displays: date, day of the week, month, and leap year. The regulator dial of the RICHARD LANGE PERPETUAL CALENDAR “Terraluna” is home not only to hours, minutes and seconds. It also houses four precisely jumping displays: date, day of the week, month, and leap year.
The patented orbital moon-phase display can be admired through the sapphire-crystal caseback of the RICHARD LANGE PERPETUAL CALENDAR “Terraluna”.

Since the dawn of humanity, the waxing and waning of the moon have fascinated mankind ‒ in spite of the fact that we have known for quite a while that the shape and size of the moon only appear to be changing during its journey around our planet. In actual fact, the changes in its appearance are due to its constellation relative to the earth and the sun. A phenomenon that the RICHARD LANGE PERPETUAL CALENDAR “Terraluna” reproduces with such precision ‒ hardly any other mechanical timepiece is in the same league.

A portrait of Richard Lange appears. Display: A watch in the spirit of Richard Lange. This is followed by exquisite close-up views of a gold pocket-watch, its vibrating balance-wheel and its breathing balance-spring. Display: He turned fine watchmaking into precision watchmaking. The picture of the antique vibrating balance-wheel gives way – almost imperceptibly – to the vibrating balance of the RICHARD LANGE PERPETUAL CALENDER “Terraluna”. We witness the jumping of the patented constant-force escapement. A detailed view of the power-reserve indication follows. Display: 14 days of constant precision. Then a detail of the calendar displays. Display: perpetual calendar. The day-of-the-week indication jumps from Monday to Tuesday. Display: precisely jumping indications. We turn around the side of the case. Display: committed to precision and serving science. In an animation we see a multitude of stars, which deposit themselves on the large celestial disc on the movement side of the RICHARD LANGE “Terraluna”. Suddenly the moon, earth and celestial discs begin to turn in time-lapse, demonstrating the functioning of the orbital moon-phase display. From the rear view, the watch case turns over to the dial side. In a front view of the full watch-face the calendar indications change instantly from Tuesday 25th to Wednesday 26th October.

Movement L096.1

Number of parts

787

Number of rubies

80

Number of chatons

2

Power reserve

336 hours when fully wound

Oscillator

Frequency: 21600 semi-oscillations per hour

Beat-adjustment system: Screw balance

Movement measures

Diameter: 37.3 mm; height: 11.1 mm

Movement Movement
Movement Movement