Tap a day for details.
Rokuyo is a six-day cycle of fortune labels from the traditional Japanese lunisolar calendar: Sensho, Tomobiki, Senbu, Butsumetsu, Taian and Shakko, repeating in order. This tool shows the rokuyo for every day of a month in a colour-coded calendar, along with the old lunar (kyureki) date. Move to the previous or next month or jump back to today, and tap any day to see its meaning (Taian is auspicious all day, Butsumetsu is unlucky all day, funerals are avoided on Tomobiki, and so on) plus its lunar date. The "highlight" option emphasises a single rokuyo — for example only Taian or only Butsumetsu — which is useful when choosing a date for a wedding, registration, shop opening, moving house or a car delivery. Rokuyo is determined by the remainder of (lunar month + lunar day) divided by 6; this tool derives the lunar date by computing the new moon and the major solar terms astronomically. Everything runs in your browser; the dates you view are never stored or uploaded.
How to use
- Read the colour-coded rokuyo and lunar date shown on each day of the calendar.
- Use "‹ ›" to change month or "Today" to return; tap a day for its meaning and lunar date.
- Use "Highlight" to spotlight one rokuyo (e.g. only Taian) when choosing a date.
FAQ
What is the order and meaning of the rokuyo?
The cycle runs Sensho (good in the morning) → Tomobiki (bad at noon, funerals avoided) → Senbu (good in the afternoon) → Butsumetsu (unlucky all day) → Taian (auspicious all day) → Shakko (lucky only around noon). The order resets at the start of each lunar month, so it does not always advance by exactly one each day.
How is the rokuyo calculated?
Rokuyo equals (lunar month + lunar day) modulo 6. This tool computes the lunar date from the astronomical new moon and the major solar terms (chuki), then derives the rokuyo from it.
Can the rokuyo differ from a printed calendar?
Rarely a day may appear shifted by one compared with a printed almanac, due to differences in how the new moon and solar terms are computed and the reference time (Japan Standard Time). For important occasions, double-check against another calendar.
Are the dates I view stored?
No. All calculation runs in your browser; the dates you view and the options you pick are never sent to any server.