App differences are not errors but different school rules behind them; understand the gap and fix one rule set so your chart stays consistent.
What This Question Is Really Asking
Three apps, three charts causes panic, yet major stars mostly agree, differing in transformations and minor stars; rather than switching apps, understand the source and lock one set.
The Underlying Logic
Zi-hour issue: whether 23:00–24:00 is that day's late Zi or next day's Zi shifts Life palace and day master by a day—the biggest source.
Transformation tables: Geng (whether Sun or Tai Yin gets Lu, etc.) and Ren stems differ by school, changing transformation placement.
True solar time: whether Beijing time is corrected by birthplace longitude; borderline-hour births may shift palace.
Star rules: leap-month handling, some minor-star placements and decade starts differ, mostly affecting assistants; the major-star twelve-palace frame is usually stable—fix one rule set and app.
A Step-by-Step Way to Read It
- Check whether birth time borders 23:00 and fix the Zi-hour convention
- Choose your school's Geng/Ren transformation table
- Decide whether to use true solar time and keep it
- Fix leap-month and decade-start rules too
- Thereafter use one app consistently
- Apps only cast; interpretation combines rules and reality
Three Common Mistakes
Mistake 1: Thinking differing apps mean all are wrong
Mistake 2: Ignoring early/late Zi hour, the biggest source
Mistake 3: Switching rule sets day to day
Back to Your Own Chart
App differences are essentially school-rule differences, not math errors. Fix early/late Zi hour, transformation tables and true solar time, stick to one app, and you hold a stable chart for long-term reference.
Reading Order
- Cast the natal chart first and locate the palaces and major stars tied to why chart apps differ before judging anything
- Open the triple-direction of those palaces and count the auspicious, malefic and assistant stars separately
- Check where the natal Four Transformations land to set the chart's baseline tone
- Read the decade-limit transformations to see whether the why chart apps differ line is activated in this stage
- Then read the annual transformations and the year's palace to pin down this year's trigger and timing
- Layer natal, decade and year before concluding, then decide how to act rather than labeling good or bad