Citizen Tsuki-Yomi Moon Phase Eco-Drive BY1030-09A
The allure of the Moon on your wrist
The Citizen Tsuki-Yomi Moon Phase BY1030-09A celebrates the connection between time and lunar cycles through an elegant design rich in detail. The white dial, enhanced by applied silver-tone markers and a blue second hand, features a moon phase display at 6 o'clock, adding a distinctive and captivating element to timekeeping.
Eco-Drive: powered by light
Eco-Drive technology converts natural and artificial light into energy, eliminating the need for regular battery replacements. The H874 calibre provides approximately six months of power reserve, extending up to two and a half years with the Power Save function. The four-level power reserve indicator allows you to monitor the charge directly on the dial.
The precision of radio-controlled timekeeping
The radio-controlled system receives time signals from five transmitters across four geographical regions: the United States, Europe, Japan and China. Daily automatic synchronisation helps maintain accurate time, while the World Time function allows you to select local time across 24 time zones. The perpetual calendar automatically accounts for different month lengths and leap years up to 2100.
Moon phases and dial functions
The Moon Phase – Luna Program automatically calculates the lunar phase based on the watch's date and time, updating the display accordingly. You can also select the Moon representation for the Northern or Southern Hemisphere and manually calibrate the lunar phase. The dial also features the day of the week, a 24-hour indicator and a date display, bringing together useful information in a balanced layout.
Everyday elegance and comfort
The naturally finished stainless steel case pairs with a blue calfskin leather strap featuring a crocodile-style embossed pattern and a safety folding clasp. The flat sapphire crystal protects the dial, while luminous hands and markers improve readability in low-light conditions. Measuring 42 mm in diameter and 10.7 mm in thickness, and weighing just 82 grams, this model offers an elegant presence and comfortable wear. Water resistance to 10 bar completes a timepiece designed to accompany everyday life with confidence.
Tsuki-Yomi: technology and fascination
The Citizen Tsuki-Yomi Moon Phase combines the innovation of radio-controlled timekeeping and Eco-Drive power with the timeless appeal of lunar phases. Designed for those who appreciate technological precision, advanced functions and refined aesthetics, it stands out through its carefully considered details.
