Jacob & Co. Astronomia Sky
An extraordinary timepiece with panoramic views of celestial bodies and a three-axis tourbillon of gravity.
Jacob Arabo, the founder of Jacob & Co., said: “As a sailor driven by celestial bodies to the sea, I found my star: Astronomia Sky,” Jacob & Co. founder Jacob & Co. said from the clock of Astronomia Town Draw inspiration from technical and aesthetic masterpieces.
In 2014, Jacobs had already launched an astronomical gravitational three-axis tourbillon. This year, it added unprecedented complications: a three-dimensional star display combined with an oval sky indicator and a 24-hour day and night display.
Sidereal time
The astronomical dial covers the inner surface of the Astronomia case and completes a rotation in a sidereal year-this is the actual time it takes for the earth to circle the sun relative to a fixed star. The blue grade 5 titanium dial is decorated with 18K gold stars, hand-engraved and Zodiac signs.
Oval sky indicator
Above this celestial dial is an oval sky indicator, which shows the part of the stars visible from the northern hemisphere. The indicator rotates a full circle in a sidereal day. A sidereal day is the time it takes for the earth to make one revolution around its axis: 23.5640916 hours.
Day/night indicator
In the center of the satellite axis, a hand-carved lacquered titanium globe rotates within a colored semi-dome sapphire, symbolizing night and day.
The third satellite of Satellites Race is Orbital Second Hand, a hollow titanium wheel that rotates once in 60 seconds with the second hand, and it also rotates around the dial every 20 minutes. On the fourth and final satellite is the patented “Jacob Cut” red moon, which is a spherical orange sapphire with 288 facets. This sapphire is the first of the modern jewellery industry. It revolves around its axis every 60 seconds and around the dial every 20 minutes.
Rotating around the watch are four satellite arms, which rotate around the dial every 20 minutes, so when you look at the watch, it will never be exactly the same. On one of the satellites is a three-axis gravity tourbillon, which rotates on one axis for 60 seconds, the second axis rotates every five minutes, and the dial rotates every 20 minutes. On the other satellite is the time (hour and minute) subdial. Thanks to the clever differential gear system, the time display is always in the correct position when rotating around the dial, in other words, 12 is always up.
Optimize settings
Jacob & Co. found a simple solution for the setting of this complex timepiece. The Astronomia Sky watch has two bows and two wheels on the back, making it easy to set up. One bow is used to set the time and day/night indicator (both based on the 24-hour solar time), while the other bow is used for the winding mechanical movement. One of the wheels is used to set the stars, and the other wheel is used to set the oval sky indicator.
All these functions are powered by the unique Jacob & Co movement JCAM11, which is manually wound. The movement has a diameter of 40 mm and includes 395 titanium parts and 42 jewels. It beats at a speed of 21’600 vib/h and provides a power reserve of 60 hours. The splints and bridge plates are hand polished and polished.
The 47 mm case is made of 18K rose gold with sapphire holes on both sides. Water resistant to 30 meters, it is equipped with an 18K rose gold case back.
The vintage watches is equipped with an alligator leather strap with an 18K rose gold folding clasp.
