After the stunning Astronomia that appeared at Baselworld 2015, Jacob & Co. is launching a new UFO in the Haute Horlogerie galaxy this year, featuring a world premiere in the modern High Jewelry universe. The patented Jacob Cut of the spherical 288-facet diamond symbolizing the moon lights up the celestial vault depicted on the dial that it sweeps around in 20 minutes, all the while performing 60-second rotations on its own axis. Truly mesmerizing ! Yet this is only one of the eight main characteristics of the Astronomia Sky, equipped with a triple-axis gravitational tourbillon with astronomical sidereal display. For the first time ever, a sidereal calendar is depicted in three dimensions, while a star-studded sky appearing on a grade 5 titanium dial makes one rotation in a sidereal year : the time required for the Earth to complete its orbit and, as seen from the earth, for the sun to regain the same position among the stars in the celestial vault. The globe levitating in the center naturally performs its rotation in one sidereal day and is complemented by a day/night indicator. The Astronomia Sky also comprises a perpetual calendar, with months displayed on the edge of the dial and visible through the domed crystal. Asking for the moon is no longer enough; wearing the galaxy on their wrist will be the exclusive privilege of 18 lucky future owners.