DESCRIPTION
The Patek Philippe reference 5102J-001, also known as the Celestial, embodies a funtion which is highly unusual for a wristwatch. The nigh sky of the northern hemisphere rotates counterclockwise on its dial, showing the angular progression of the stars relative to the meridian passage of Sirius. At the same time, the display shows the meridian passage and the phases of the moon. Two hands from the centre show the hours and minutes of mean solar time on a dial with Roman numerals.
The 43mm case is made of 18k yellow gold, complementing the deep blue sky chart on the dial.