Thirty years ago, Citizen released a multi-band atomic syncing watch, which resulted in a watch with some rather unparalleled accuracy. To celebrate that mark, Citizen is back with a new atomic-syncing watch, and even threw in an automatically-adjusting moonphase complication. Meet the Citizen Tsuki-yomi A-T.

Solar Watch

While we all undoubtedly have a number of mechanical watches that we like, there’s no denying the practicality of a watch that is not only solar-powered (or any light source, realistically), but can also receive the atomic radio signals to ensure that the watch is always accurate. With the new H874 movement, the Citizen Tsuki-yomi A-T actually stays to within ±15 seconds per month without that sync; with it, of course, you’re always on time.

Moonphase Watch

That signal sync also enables some other neat tricks, as well. For one, you’ve got a perpetual calendar, so it always knows what the date is. Even more interesting than that, however, is the automatic adjustment of the moonphase display. Using their algorithm, along with the radio signals, the moonphase will always be accurate. Additionally, if your travels take you from the northern to the southern hemisphere, the moonphase display will automatically shift to reflect what you see in the sky. That, friends, is an extremely clever use of the technology.

Citizen Tsuki-yomi A-T: World Time

Fittingly, the Citizen Tsuki-yomi A-T is also able to track/display world time, meaning that this is a watch ready to go traveling with you. While the case does come in at 43, it – and the bracelet – are made of a hardened titanium, which should be relatively light (for the size) and very scratch resistant.

Citizen Tsuki-yomi A-T World Time: Price

I’ve long maintained that a solar and atomic time syncing watch is something that should be in just about everyone’s collection, and the Citizen Tsuki-yomi A-T is a very accomplished entry into that category. It’s available in three different colors – silvery white, blue (once in a blue moon, anyone?) or blood moon red. If you want to pick one up, they’re available for $850 directly from

Tech Specs from Citizen

  • Case / Band: Super Titanium
  • Glass: sapphire with AR coating
  • Case diameter / thickness: 43 mm / 10.9mm
  • Movement
    • Cal.H874 / Accuracy ±15 seconds per month (without time signal reception
    • Eco-Drive running for 2.5 years on full charge ( in power save mode)
    • Radio-Controlled
    • World Time
    • “Luna Program” moon phase
    • Perpetual Calendar
  • Luminous (hands + index)
  • Water Resistant: 10 BAR/100M

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Author Expertise / Author Experience

Patrick Kansa

A big data developer and leader with a penchant for gadgets, books, watches and beverages. You can find my work on WristWatchReview. If you’re on Twitter and/or Instagram, you’ll find me there as @PatrickWatches.

ByPatrick Kansa

A big data developer and leader with a penchant for gadgets, books, watches and beverages. You can find my work on WristWatchReview, Knapsack.News, and Slushpile. If you're on Twitter and/or Instagram, you'll find me there as @PatrickWatches.

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