Presenting the grey edition Citizen 'Tsuki-yomi' Radio-Controlled Moon Phase, the world’s first light-powered radio-controlled moon phase movement. In celebration of the 30th anniversary of the first Citizen radio-controlled watch, the brand are debuting the world’s first fully analogue moon phase function for light-powered watches. The Tsuki-yomi collection (which translates to “reading the moon”) has a new radio-controlled Eco-Drive Cal. H874 movement that provides ±15 seconds accuracy per month, a revolutionary proprietary Super Titanium case and bracelet, and artfully crafted moon pattern dials. The watch calculates the phase of the moon each day by using signals received from multi-band radio transmitters combined with a unique mathematical formula developed by Citizen called “Luna Program”. The phase of the moon is then automatically adjusted and displayed at the six o’clock position. Sustainably powered by any light, including moon light, with our proprietary Eco-Drive technology, this timepiece never needs a battery. • Powered by the Eco-Drive movement, which harnesses light from both natural and artificial sources. with a power reserve of up to 6 months. • Presented on a silver titanium bracelet with push button deployment clasp. • Scratch resistant sapphire crystal glass. • 43mm case width. • 100 metre water resistance.