How It Works
The same birth date and target date produce the same result through a date-based calculation.
1. Date-only natal Sun
Because no birth time or place is requested, the system calculates solar longitude at noon UTC on the birth date. It is not a full natal chart and does not include houses, the Ascendant, or a precise natal Moon.
2. Seven current bodies
The Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn are calculated for a consistent daily reference time and compared with the natal Sun. Technical signals are translated into everyday themes such as conversation, judgment, pace, and action.
3. Main and month stars
The main star uses the calculated Risshun boundary; the month star uses twelve solar-term entries. A boundary day remains approximate without birth time. These patterns contribute modest tendencies rather than deciding the result by themselves.
4. How wording is produced
The free version combines edited text associated with calculated signals, so it appears immediately. Premium is not publicly available yet. Development testing sends only derived calculation data—not a raw birth date—to OpenAI for a longer interpretation.