Citizen | ‘Tsuki-Yomi’ Radio-Controlled Moon Phase | BY1010-57L

Citizen ‘Tsuki-Yomi’ Radio-Controlled Moon Phase Watch Blue Dial

Introducing the Citizen ‘Tsuki-yomi’ Radio-Controlled Moon Phase – the world’s first light-powered radio-controlled moon phase movement. To celebrate the 30th anniversary of the first CITIZEN radio-controlled watch, they are debuting the world’s first fully analogue moon phase function for light-powered watches.

The world’s first fully analogue moon phase function for light-powered watches

The Tsuki-yomi collection (directly translating to “reading the moon”) features a new radio-controlled Eco-Drive Calibre H874 movement that provides ±15 seconds accuracy per month. Based on a unique mathematical formula developed by CITIZEN called “Luna Program”, the watch calculates the phase of the moon each day from signals received from multi-band radio transmitters. The phase of the moon at the six o’clock position is then automatically adjusted and displayed.

Blue Dial with Moon Surface Pattern

The Moon Phase dial features a striking blue pattern of the moon’s surface with a black outer ring, and date display at the 4 o’clock position (view green dial version here).

Additionally, the luminous hands and markers ensure readability in any lighting condition. Also, the easy-grip crown and pushers complete the watch’s robust lineup.

Case and Bracelet

Crafted from lightweight, durable Silver Tone Super Titanium™, the Citizen Tsuki-Yomi Moon Phase Watch has a 43mm case. Additionally, the Super Titanium™ bracelet has a folding clasp with secure push button release.

Finally, rest easy with a fantastic Five-Year Warranty, ensuring long-term peace of mind.

Technical Specifications:

• Light powered Eco-Drive radio-controlled moon phase movement Cal. H874
• Radio-Controlled Atomic Clock Synchronisation for Superior Accuracy, 12/24 Hour Time
• ±15 seconds accuracy per month
• Silver Tone Super Titanium™ case, 43mm diameter
• Blue dial with moon surface pattern, luminous hands and markers
• Date
• Silver Tone Super Titanium™ Bracelet with Fold Over Clasp
• Sapphire crystal
• Water resistant to 10 bar (100m) – suitable for swimming, showering and snorkelling
• Five Year Manufacturer’s Warranty