Calculation method

The Eastern chart uses Year, Month, Day, and Hour pillars, hidden stems, Five Elements balance, Ten Gods, useful and favorable elements, chart interactions, and longer luck cycles.

When birth time and place are known, Zodiaq adjusts civil clock time using longitude, the timezone standard meridian, and the Equation of Time before calculating the Day and Hour pillars. This matters most for places far from the center of a timezone and for births near a two-hour or day boundary.

BaZi years and months use solar-term boundaries rather than January 1 or lunar-month boundaries. Zodiaq uses minute-level solar-term timing for Li Chun and the other Jie boundaries, and applies the traditional 23:00 Zi-hour day rollover.

Western calculations use the birth date, local time, coordinates, and the historical IANA timezone when available. Historical daylight-saving changes are resolved from the timezone instead of trusting a stale numeric offset.

Timing is not a generic good-day score. It combines the personal elemental balance with the current longer luck cycle, annual and monthly Eastern cycles, chart clashes or support, and Western current-sky context when that layer is available.

If birth time, coordinates, or timezone information is missing, Zodiaq lowers calculation confidence and avoids treating the Hour pillar or time-sensitive Western angles as exact.