The MooN is a mechanical high-tech lunar-phase-watch of the superlative. It´s display is luminesce, patented and depicts the lunar cycle of the northern and southern hemisphere realistic like a photograph with a maximum divergence of only one day in 122,5 years. For a complete Astron rotation the moon needs siderisch 27,3217 and synodisch 29,52 days. A simple lunar-phase-watch measures one moon cycle with 275 days. To keep the lunar-phase-watch precise a very complicated wheel work is needed.