The Atomic Timekeeping collection is synchronized to the atomic clock for superior accuracy.
Atomic Timekeeping Technology
Atomic Timekeeping Technology Precise Time for You Always
We launched the world’s first multi-band Atomic Timekeeping watch in 1993, and remain a pioneer of this field. Combined with our proprietary light powered Eco-Drive technology, when owning a Citizen Atomic Timekeeping watch you will get precise time powered by any light source.
The Element of Precision
With a margin of error of just one second in 100,000 years, CITIZEN’s watches receive radio signals from an atomic clock to set the time correctly.
Automatic and convenient
To avoid interference with smartphones and other electronics used during our busy days our Atomic Timekeeping watches receive radio signals late at night to adjust your watch to the correct time and day.
A signal containing the precise time, day and date, measured by an atomic clock accurate to one second every 100,000 years, is sent directly to the watch using standard radio waves.
Four major regions of reception
The current geographical areas covered by this service are Japan, China, North America and Europe.
1. Available zones indicated on the maps are based on rough calculations and do not represent exact geographical availability.
2. Reception ranges differ depending on each watch’s function.
3. Buildings and other obstructions, as well as adverse weather conditions can impact signal reception.
For the Most Accurate Time
In 1989, in the never-ending quest of every maker of timepieces to ensure ultra precision, CITIZEN began development of its Atomic Timekeeping Technology. We were the first Japanese watchmaker to take up this challenge, so we had to overcome numerous obstacles, from creating the equipment needed to develop the technology, to coming up with measuring instruments to evaluate reception performance using antennas placed on window sills in the lab. These efforts allowed CITIZEN to achieve Japan’s first standard radio signal reception IC.
World’s First Multi-Band Atomic Timekeeping Watch
Overcoming many technological hurdles, in 1993 CITIZEN debuted the world’s first “multi-band Radio Controlled/Atomic Timekeeping watch.” The antenna, the heart of signal reception sensitivity, would be prone to interference from metal watch cases and parts, which is why we prominently placed it in the center of the dial. The result was a highly distinctive design that boldly highlighted our new technology to ensure accuracy.
Putting both Design and Function First
In the following years, CITIZEN’s advances would lead to watches that no longer needed to show off radio wave functionality on the outside of the watch. We worked first with resin and then ceramic cases which were a better conduit for the signal reception with the hopes of one day being able to use full metal cases
With better antenna and receiver circuits, we realized the once “impossible” full (including the back lid) metal case in 2003. This model became very popular, pushing recognition of the radio wave category.
World’s first multi-band radio controlled watch
World’s first light-powered radio controlled watch with a full metal case
Reducing the Profile while Enhancing Performance
Atomic Timekeeping watches have evolved into a core product line at CITIZEN since we offered the first model with a full metal case in 2003. We have continued our work on related technologies to realize a wide lineup of beautiful watches that keep getting smaller and thinner. Part of this work has been on making the antennas smaller without sacrificing performance. We have come a long way, but the possibilities continue to open before us.