Jacob & Co. replica

How are the complications of the Astronomia achieved?

Jacob & Co. Astronomia Complications: A Complete Breakdown of “Mechanical Principles + Structural Implementation” Explaining in layman’s terms: How are the four legendary functions—a three-dimensional orbital platform, a three-axis tourbillon, a dial always facing upwards, and the rotation of the Earth/celestial bodies—achieved step-by-step through gear architecture and transmission layout?

I. Understanding the Overall Underlying Architecture
Ordinary Watches: Planar layered structure, the movement lies flat, and all gears operate on a single plane.

Astronomia: Vertical Central Axis + Suspended Cross Rotating Platform
A main vertical central axis stands at the very center of the case.
A cross-shaped four-arm rotating bridge is mounted on the axis.
The entire cross bridge revolves around the central axis once every 20 minutes.
The four arms respectively hold: a three-axis tourbillon, hour and minute dials, a globe, and a sunburst diamond.
All complications are built upon this fundamental “global 20-minute revolution.”

II. Core 1: How is the 20-minute global revolution achieved? The movement’s bottom layer features a reduction gear train, receiving power from the mainspring. This power is reduced in speed through multiple gear sets, ultimately driving the central vertical main drive shaft. This main drive shaft then rotates the upper cross bridge at a uniform speed.

Transmission logic: Mainspring barrel → Conventional gear train → Multi-stage reduction gear set → Central vertical shaft → Cross bridge (one revolution every 20 minutes).

Challenges: Three-dimensional vertical transmission, axial force balance, and micro-backlash control; otherwise, the four cantilever arms would eccentrically vibrate.

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