How it works
From a birth certificate to a conversation that continues
Five steps. Two of them are mathematics, and that is what separates a reading about you from a text that would fit anyone.
- 01
You give three pieces of information
Date, time and city of birth. That is all. We resolve the time zone, including historical daylight saving — someone born in January 1994 in São Paulo was born at UTC−2, and that is where almost every app gets the Ascendant wrong.
If you do not know the time, that is fine. We compute what can be computed and say on screen what is left out, instead of guessing an Ascendant.
- 02
The engine computes the chart
True geocentric positions for eleven bodies, Placidus houses by iterative semi-arc solution, aspects with variable orb and applying or separating detection.
The language model never does this arithmetic. It misses by a few degrees, which changes the house and changes the sign — and you notice on the first reading. The mathematics is deterministic and checked against an independent implementation.
- 03
The conversation starts
The AI receives your chart as degree, house and aspect, plus the transits active today. It interprets those concrete numbers, not a general idea of "you are an Aries".
Every answer keeps the exact context that generated it. If you want to know why it said something, it can be reconstructed.
- 04
It starts to remember
From what was said, it extracts what is durable: people you mentioned, themes that return, decisions left open. Not the text of the conversation — what the conversation revealed.
Relevance decays with time and rises when a subject returns, so memory ages like human memory instead of growing forever. You see the whole list and delete whatever you want.
- 05
When the question deserves a letter
You write to the specialist for the subject — work, relationships, grief, money. It is a subject specialist: an intelligence trained deeply in that field, reading your letter with your chart and your history beside it.
Before it goes out, the answer is read in full by a human specialist, who corrects, deepens and signs it — their name comes in the letter. It is not a person writing from scratch nor a machine answering alone, and we would rather say so than let you find out.
Under the hood
What we verify before showing you anything
Sun vs Meeus
Δ 0.004°
Checked against an independent implementation of the Meeus series, not against the library itself.
Tropical year
365.2390 d
It emerges from the computation: the interval between two consecutive March equinoxes.
Synodic month
29.5259 d
Average of 14 lunations. A single lunation ranges from 29.27 to 29.83 days.
Mercury retrograde
66 days/year
An indirect test of the velocity derivative, which is what marks retrogradation.
Forty checks in total, run on every change to the engine. The March 2026 equinox comes out on 03/20 at 14:45:34 UTC — matching what observatories publish.
Why every draw is recorded
Each draw has a seed combining a server secret, your question and the exact instant. From it, the shuffle is reproducible.
That serves two purposes. If you question a reading, we reproduce the exact draw. And, more importantly, not even whoever operates the platform can choose the card that would justify an offer — the most documented abuse pattern in this category abroad.
Why the review is human
An intelligence trained on a subject writes fast and writes well — and still misses what only someone who works with people notices: the wrong tone at the wrong moment, certainty where doubt belonged, advice that ignores the real life of whoever asked.
So every letter goes through a human specialist before it leaves, and their name is signed on it. It is slower and more expensive than publishing directly — and it is the difference between a beautiful text and an answer someone stands behind.
See Astropeia Pro