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About 星と暦の占い

星と暦の占い brings together Eastern calendar traditions—Four Pillars and Nine Star Ki—and Western traditions of astrology, numerology and tarot, with the aim of making detailed readings freely available to everyone.

About the calculations

• Four Pillars and Nine Star Ki: astronomical calculations determine the boundary instants of the 24 solar terms, establishing year boundaries at the Beginning of Spring and month boundaries at the corresponding terms. These are checked against the National Astronomical Observatory of Japan's calendar data.
• Western astrology: Astronomy Engine calculates the ecliptic longitudes of the Sun, Moon and planets at birth, using the tropical zodiac and geocentric positions. The Ascendant is calculated from the birthplace's latitude and longitude and sidereal time.
• Numerology: all digits of the birth date are added, with 11, 22 and 33 treated as master numbers.
• Birth time: the local clock time is converted to UTC using the birthplace's standard and daylight-saving time, including Japan in 1948–1951 and China in 1986–1991. Longitude and the equation of time—the Sun's seasonal advance or delay—then give true solar time for the Day Pillar, Hour Pillar and Zi Wei Dou Shu. Year and Month Pillars and Nine Star Ki compare the birth instant with solar-term boundary instants.

Our content review policy

The classical texts and other sources we consulted are listedBooks and sourceson this page.

Each explanation is an original editorial summary and reconstruction in contemporary language. References include classical Four Pillars texts such as Yuan Hai Zi Ping, Di Tian Sui and Zi Ping Zhen Quan, traditional Nine Star Ki calendar annotations, the astrology of Ptolemy and Lilly, and Waite's tarot explanations, including public-domain works. The original texts are not reproduced.

Readings are offered as observations to help you reflect on life. They do not state the future as certain or use language that stirs fear. They also do not replace professional judgment in medicine, law, investment or similar fields.

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