Four boundary cases where saju/BaZi calculators quietly disagree with the almanac — solar terms as instants, the 23:00 day boundary, true solar time, and foreign births — each one a golden test in an MIT engine.

I built a calculator for BaZi — Chinese "Four Pillars" birth charts. Whatever you think of the...

Four boundary cases where saju/BaZi calculators quietly disagree with the almanac — solar terms as instants, the 23:00 day boundary, true solar time, and foreign births — each one…