Qi Men Dun Jia Calculator uses best models of mathematical astronomy.
Such concepts like aberration and nutation of ecliptics, Equation of Time are included in the math behind.
With QMDJ Calculator you can use QMDJ Charts from probably any Qimen School.
Calculation settings allow you to define rules of Calendrical calculations and Qimen Chart construction, accepted in your school.
QMDJ Calculator gives 10 free chart calculations within every 30 days period.
If you need more, you can purchase any number of days of unlimited calculations. Our price model contain volume discounts.