Citizen Eco-Drive 010, Инструкция по эксплуатации

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“±1-second yearly accuracy”
This watch keeps ±1-second yearly accuracy, that is, its time goes forward or
backward within 1 second from correct time in a year. This means that the watch
has much higher time accuracy than most popular quartz watches (±15-second
monthly accuracy).
Meaning of “±1-second yearly accuracy”
“±1-second yearly difference from the correct time” does not mean that the
difference is simple accumulation of very small difference of every day. In other
words, ±1-second yearly accuracy does not mean ±1/365-second daily accuracy.
Accuracy of a watch minutely varies every moment depending on conditions of
use and change of environment. The variation is corrected through periodical
adjustment ceaselessly to keep the difference within 1 second whole a year. That is
the meaning of “±1-second yearly accuracy”.
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