Gregorian · lunar · stems and branches · twenty-four solar terms · moon phase · mansion of the dayComputed here from the GB/T 33661—2017 standard and the JPL DE421 ephemeris · covers 2025–2050
About A calendar tool to go with Chaoshan Wiki. Solar terms follow the national standard GB/T 33661—2017 and are computed here from the JPL DE421 ephemeris. The tool gives the Gregorian and lunar date, the stems-and-branches cycle, moon phase, the lunar mansion of the day, and the traditional day-notes. The deity listings and the do-and-avoid columns reproduce an old documentary convention; they are not judgements of fortune, and are here for the study of Chaoshan seasonal custom.
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This section takes any day apart in two layers. The astronomical layer: Gregorian date, lunar date (including the length of the month and any intercalary month), the stems and branches for year, month, day and hour, the moment each of the twenty-four solar terms falls, the phase and age of the moon, the lunar mansion of the day, sunrise and sunset — all computed here from the JPL DE421 ephemeris, with solar terms defined by GB/T 33661—2017, Calculation and promulgation of the Chinese calendar, and checked item by item against the values published by the Purple Mountain Observatory (all 24 terms of 2026 agree, 24 of 24).
The customary layer: the twelve day-officers of the jianchu cycle, the daily do-and-avoid lines, the nayin element, the zodiac clash and the deity listings. These reproduce a traditional format and name their documentary origin item by item. The old reckoners counted days by the twenty-eight mansions and fixed fortune by the jianchu cycle; that was a convention, not a measurement — the Xieji Bianfang Shu itself says that forcing an uneven heaven to run through a fixed set of stations is “in no way a workable principle”. The table therefore lists the convention only and makes no judgement of fortune.
Chaoshan season The tool serves the study of Chaoshan custom, the ritual year and lineage sacrifice. For when the processions fall, see the procession calendar; for the calendar basis of the festivals, see The ritual year; for choosing days in the rites of life, see Rites of life. For the origin of the eight festivals and how people here keep them, see the entry the eight festivals of the year.
WeChat mini program Look up the Chaoshan ritual calendar on a phone. QR code to be added
Sources The customary layer follows traditional works such as the imperially commissioned Xieji Bianfang Shu; the ephemeris data is computed from JPL DE421 and the solar terms follow GB/T 33661—2017. The tool serves research on Chaoshan custom, the ritual year and lineage sacrifice.
Conventions All dates are Beijing time (UTC+8). The “Today” button takes the local date of your device, so if you are outside UTC+8 the two may differ by a day. The data table runs from 1 January 2025 to 31 December 2050; dates outside that range are not extrapolated and the page will ask you to choose another. All computation happens in your browser, the table loads with the page, and no request goes to the server when you pick a date. The engine is the same as the column of that name at Kuang Chujia’s research site on historical astronomy and calendars, so the two can be recomputed against each other.