紫微

Ziwei Calc (紫微) is a professional Ziwei natal-chart extension that automatically generates detailed Ziwei charts from user input. It displays the twelve palaces with stars, stems and branches, palace names, life signs, twelve deities, major/minor limits, and upper-panel details like name, lunar and solar dates, zodiac, yin/yang, and gender.

The center area shows optional pillar arrangements, life and body palaces and masters, Five Elements Bureau, and related data. Single-click any palace to view full palace details in the center; double-click to switch to the Three-Fang Four-Zheng view for deeper analysis. Additional features include Bazi software integration, preferences for year division (Beginning of Spring or Lunar New Year), Zi-hour handling, adaptive fonts for various screens (including large iPads), extended time-input support, Lu/Quan/Ke/Ji information, and support for years 1600–2200.