CALCULATION METHOD
The same inputs should reproduce the same chart
DIRECT ANSWER
Charts are calculated by fixed rules, not improvised by a chat model. Identical birth inputs and calculation versions should produce the same result.
01
Inputs and time
The chart uses birth date, local time, gender, and birthplace. Location supports historical timezone and true-solar-time correction. Time-dependent results remain provisional when birth time is uncertain.
02
Versions and reproducibility
Calculation logic and editorial interpretation are versioned separately. Copy edits do not silently alter chart identity; rule changes must pass fixed test cases.