How accurate Viki’s calculations are
Planetary positions come from NASA JPL Horizons ephemerides — the same source professional astrology software uses. It’s a programmatic calculation, not a neural network’s guess. Aspects use honest orbs: if an aspect isn’t there, Viki says it isn’t there rather than stretching it for a prettier reading.
What code calculates and what the network writes
The distinction matters. All numbers — planet positions, house borders, aspect angles, the Pythagorean square — are computed by code from formulas and NASA data. The neural network handles the words: it explains the results in human language.
So Viki cannot invent a Mars position: it arrives from a calculation.
Why JPL Horizons
It’s NASA’s Jet Propulsion Laboratory service, supplying solar-system positions with the highest available precision. That especially matters for Chiron: its orbit is irregular, and approximate formulas drift visibly.
Honest orbs
The orb is the allowance within which an aspect counts. Some services inflate orbs so the reading looks rich. Viki keeps them within reason: a half-degree aspect and a nine-degree «aspect» are not the same thing.
Where precision ends
- If the birth time is approximate, the houses and Ascendant are approximate — no maths can fix that.
- If the city is vague, the time zone may resolve wrongly.
- Interpretation is not a science: different schools read the same configuration differently.
You can verify
Take any professional program or a trusted site, enter the same data and the same house system — the numbers should match. If they don’t, it’s almost always the house system or the time zone.
The program calculates. Viki explains.