Celebrating 30 years since the release of Citizen?s first atomic timekeeping watch, the new Tsuki-yoma A-T shows the evolution of the brand?s technical prowess and Citizen?s penchant for looking skyward for inspiration.

Named after the ancient Japanese moon god, the Tsuki-yomi collection lives up to its namesake. Informed by a mathematical formula developed by Citizen, this watch calculates the phase of the moon each day from signals received from multi-band radio transmitters. These signals then are interpreted at the 6 o?clock mark of the dial, adjusting as the natural phases of the move wax and wane throughout the month. Technically speaking, that?s not even the most impressive feature of this watch?s use of the Luna Program technology. The watch will also switch the moon phase display to match the view either from the Northern or Southern Hemisphere, leaving wearers to easily navigate from Australia to New Mexico without having to manually change the moon phases yourself.  The dial is finished with a world time subdial in 24 time zones, a perpetual calendar, and day-date functionality at 4 o?clock.

The watch comes in three colorways, blue, silver, and red. Each is housed in a 43mm scratch-resistant Super Titanium case with a sapphire crystal, each durably made to be taken on your next adventure. All three references are powered by the atomic timekeeping movement, Eco-Drive 2 Cal. H874, which can run for upwards of 2.5 years on a full charge. 

The Tsu...