@JacobandCo - The Astronomia Sky stays true to the original layout of the Astronomia’s iconic caliber construction: the entire four-arm assembly of its Exclusive JCAM11 Caliber rotates, a truly unprecedented engineering and watchmaking achievement that is as spectacular, as challenging it is to realize. Its four rotating arms and the complications they carry all float through the space between its front sapphire crystal and blued Titanium celestial dial. The four arms of the Astronomia Sky carry the gravitational triple-axis tourbillon that is the timekeeping organ of the watch, the orbital, double-axis, vertical seconds indication, an exclusive Jacob-Cut® 1-carat diamond, and a differential-leveled time display. This four-arm assembly completes a rotation around the center of the watch in 20 minutes. Another outstanding feature of the Astronomia Sky is how each pair of opposing arms are perfectly calculated counterweights of one another - a testament to peerless materials engineering and watch movement design. By having equal weights on these opposing arms, its axles are relieved from strain and increased pull, as the movement takes up different orientations in space.