The Jaeger-LeCoultre Duomètre Sphérotourbillon Moon expresses its strength of character through the realm of calendar-type horological complications. Discover the watch by clicking on “read more”
Get this! A classic moon phase shows a one-day discrepancy every two and a half years. For a Jaeger-LeCoultre Perpetual Calendar, that difference amounts to just one day every 122 years. Now the Duomètre Sphérotourbillon Moon is from a whole different galaxy, since when its moon phase is properly adjusted, it is designed to remain accurate for a full 3,887 years! From this sense of verging on eternity stems the depth and beauty of Fine Watchmaking.
A tribute to astronomy
The moon disc is made of lapis lazuli, a rock that looks as if it has landed there down from the sky chart. It features a dusting of stars echoing the moon, hands and hour markers, creating a two-tone ambiance also differing from the traditional identity codes of the Grande Maison
Astronomy lovers will probably love this since they are passionate about the earth’s axis. Each planet spins around an axis that is never perpendicular to the orbital plane. The angle formed by the earth’s axis is around 23°. This natural tilt explains the successive seasons and it is to this posture that we owe the alternating weather patterns that delight us or occasionally upset our plans.
This penchant is shared by the additional rotation axis that gives the Sphérotourbillon its true magic. As well as performing a full turn around the axis of its titanium carriage, the Sphérotourbillon also spins around a second axis inclined at a 20° angle – a nod to the inclination of the earth that follows an imaginary line stretching to Ursae Minoris, the polestar.
Jaeger-LeCoultre Dual-Wing Concept
Dual-Wing stands for two separate and independent mechanisms united within a single case: one dedicated to precision and the other to functions, both linked to a single regulating organ ensuring extremely accurate running.
Introduced within the Jaeger-LeCoultre Duomètre à Chronographe, this decisive invention gave rise to the first chronograph maintaining the same degree of accuracy whether or not the chronograph is activated.
Through the use of the patented Dual-Wing concept, the 2 o’clock push-piece serves to reset the small seconds at 6 o’clock to zero, based on the Flyback principle. The distinctive feature of this particular flyback function is that it does not halt the operation of the regulating organ. In a classic configuration, pulling out the crown freezes the small seconds hand and the balance-spring, whereas the Duomètre Sphérotourbillon mechanism allows the small seconds hand to return to zero and restart instantly, without the balance wheel missing a beat. No time is wasted between the stopping operation and the resumption of the regulation organ’s steady to-and-fro motion. The watch thus remains accurate even when adjusting the time to the nearest second. When it comes to precision, the Duomètre Sphérotourbillon Moon is firmly engaged on all fronts.
Jaeger-LeCoultre Duomètre Sphérotourbillon Moon
- Mechanical manually-wound movement, Jaeger-LeCoultre Calibre 389, crafted, assembled and decorated by hand, nickel silver bridges and mainplate
- 2 barrels
- 45-hour power reserve
- 476 parts
- 56 jewels
- 10.45 mm thick
- 33.70 mm in diameter
- 105 parts
- Tourbillon carriage: grade 5 titanium
- Total rotation speed: 30 seconds for a complete turn
- 2 combined movements. Carriage axis rotation speed: 15 seconds for a complete turn.
rotation speed : 30 seconds for a complete turn
- Tilt of the carriage: 20°
- Diameter of the carriage: 11.50 mm
- Weight of the carriage: 0.518 grams
- 14-carat gold balance wheel with 14-carat gold eccentric inertia-blocks, inertia = 12.5 mg.cm2, 21,600 A/h
- Cylindrical balance-spring
- Hour, minute and small seconds with flyback function
- 2 Power reserves: one for the regulating organ and one for the functions
- Moon-phase indication with one day of deviation every 3887 years
- 24-hour indication
- Diameter : 42 mm
- Thickness : 14.3 mm
- Polished and satin-brushed finish
- Lateral case opening revealing the Sphérotourbillon and satin-brushed finish
- Cambered sapphire crystal
- Water-resistance: 3 bar
- Grained, silver-toned
- 4N appliques
- Hours and minutes: “leaf”-type
- Small seconds : baton-type with pear-shaped counterweight, blued steel
- One crown to wind the watch, set the time and adjust the moon-phase display
- One push-piece at 2 o’clock to activate the small seconds flyback function
- Hand-sewn alligator leather with platinum High-End pin buckle
- Q608 65 20, limited series of 75 pieces
This JLC watch is simply out of this world!!!
Thanks a lot for your fine write-up as well as lovely pictures, only wish that there were some more pictures of this outstanding timepiece!
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