How we calculate
Published openly so you can cross-check our results against any other software.
- Zodiac: Tropical (seasonal, Northern-hemisphere based).
- House system: Placidus (
P) — switchable to Whole Sign (W) in paid readings. - Lunar nodes: True Node · Lilith: Mean Lilith.
- Bodies: 10 planets + Chiron + True Node + Lilith.
- Time zones: full historical tzdata; for Vietnam 1955–1975 births we ask North/South explicitly.
- Latitudes >66°: the engine clamps to ±66° before Placidus — no crash, ASC/MC still returned.
Aspect orb table (engine defaults)
| Aspect | Orb |
|---|---|
| Conjunction | 10° |
| Opposition | 10° |
| Trine | 8° |
| Sextile | 6° |
| Square | 5° |
| Quintile | 1° |
Orb values measured on the public engine on 2026-08-06.