Jacob & Co. Astronomia Solar

Unveiled at Baselworld 2017, the Astronomia Solar wristwatch from Jacob & Co. displays eight planets of our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

Made from 18 carat red gold, 44.5mm diameter case of the Astronomia Solar houses a movement of 34.55mm diameter and 439 components in constant bi-directional rotation and a representation of the solar system, enhancing even more the celestial reality.

The vertically built Jacob & Co. manufacture caliber JCAM19 has 3 arms. The first arm holds the hour & minute dial made of sapphire, it rotates counter-clockwise to ensure that 12 o’clock is always in the correct position, regardless of where the subdial is thanks to a patented differential system. The second arm holds two axes (10 min/60seconds) gravitational flying tourbillon decorated with a Jacob & Co. logo on its cage. The third arm holds an hand-engraved globe of the Earth rotating around its own axis in 60 seconds and completing one full revolution of the dial in 10 minutes.

The center of the movement is adorned with a Citrine Jacob cut® of approx. 1.5ct. The bi-directional movement rotates clockwise to complete a full 360 degree revolution in just ten minutes, the aventurine base rotates in the opposite direction at exactly the same speed, creating an accelerated, stylized view of the solar system.

The idea behind the Jacob & Co. Astronomia collection has always been to highlight, in a playful and suitably gem-set environment, the place of the Earth in our solar system.

In the Astronomia Solar, all eight planets in the solar system are given a place on the dial for the first time, with the sun at the center in the form of a 1.5ct Citrine with the unmistakable Jacob Cut® and its 288 facets.

The hand-engraved globe of the Earth rotates about its own axis once every 60 seconds and completes one full revolution of the dial in 10 minutes, as part of an assembly that also houses the subsidiary hour and minute dial and a one-minute flying tourbillon.

The reduced case size, new functions and faster rotation speed are all made possible by an entirely new in-house movement. The hand-wound Jacob & Co. calibre JCAM19 beats at a frequency of 4Hz (28,800 vibrations per hour), which is faster than any of the other Astronomia models. Yet in spite of its smaller diameter, at just 34.55mm, it actually comprises 439 components, excluding the precious and semi-precious stones, which is more than in the other Astronomia models.

Technical details
Diameter: 44.5mm
Material: 18-carat rose gold
Case back: 18-carat rose gold
Case middle: single-piece sapphire crystal
Bows: Winding and time-setting via two 18-carat rose gold bows
Crystal: Unique domed sapphire with double anti-reflective treatment
Water resistance: 30 metres

Caliber: Jacob & Co. in-house manually-wound calibre JCAM19
Diameter: 34.55mm
Height: 16.50mm (11.70mm excluding garnet)
Components: 447 excluding the precious stones
Power Reserve: 48 hours
Frequency: 28,800 v/h (4 Hz)
Jewels: 43


Hours and minutes on subsidiary dial
60-seconds flying tourbillon bi-axial
60-seconds rotating Earth
Bi-directional movement rotating clockwise 360 degrees in 10 minutes while the aventurine base rotates counter-clockwise 360 degrees in 10 minutes

Dial and hands
Dial: Sapphire crystal with rose-gold metallization
Hands: Gun Blue
Strap and clasp

Crocodile leather
Buckle: 18-carat rose gold folding clasp

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