"Accurate" means two different things in astrology, and AstroNoir takes both seriously: the astronomy has to be correct, and the interpretation has to stay honest to your actual chart. Here's how we hold each one.

The astronomy is real

Planetary positions come from Swiss Ephemeris — the gold-standard astronomical library used by professional astrologers and observatories. Positions are accurate to a fraction of an arcsecond. We don't round to the nearest sign or fake a chart from your birthday alone: your reading is built from the true sky at your exact time and place of birth.

That precision matters because astrology lives in the details. A planet a degree or two off can fall in a different house, form or break an aspect, and change the meaning of an entire section. Get the math wrong and everything downstream is wrong. So we get the math right first.

We follow the established rules

On top of real positions, AstroNoir applies the defined logic of the craft — not vibes:

Houses — the twelve life areas, from your exact ascendant
Aspects & orbs — the angles between bodies, within accepted tolerances
Dignity & reception — how strong or supported a planet is by sign
Sect — whether you're a day or night chart, which shifts emphasis
140+ bodies — all planets plus asteroids and sensitive points most apps ignore

The engine applies these rules consistently to real data. Two people with the same placements get the same astrological logic — what differs is the chart, not the method.

Precision you can see

This isn't hand-waving. Every aspect AstroNoir reads carries its exact measurement — the orb to a thousandth of a degree, graded against defined tolerances, with its motion and its timing:

{
  "aspect": "Mercury opposition natal Jupiter",
  "orb": 0.023,
  "orb_bucket": { "label": "exact", "max": 1 },
  "motion": "applying",
  "peak": "2026-06-03"
}

A few things that level of precision buys you:

Orbs to three decimals. 0.023° isn't "close enough" — it's measured. An aspect at 0.02° lands differently than one at 2°, and we know the difference to the decimal.
Defined orb tolerances. Every aspect is bucketed against fixed limits — exact (≤ 1°), tight (≤ 3°), and so on — so "strong" and "weak" aren't opinions, they're thresholds.
Applying vs separating. We track whether an aspect is still building (applying) or already fading (separating) — a real astrological distinction most apps drop entirely.
Live house & sign tracking. Every planet's house and sign is followed continuously, not just frozen at birth:

Jupiter   → House 11   (Cancer)
Saturn    → House 9    (Aries)
Uranus    → House 10   (Gemini)
Neptune   → House 8    (Aries)
Pluto     → House 6    (Aquarius)

Nothing here is rounded, assumed, or improvised. It's measured to the decimal, graded by rule, and timed to the day.

We use the tropical zodiac

AstroNoir is built on the tropical zodiac — the system anchored to the seasons and the equinoxes, used across Western astrology. It's a deliberate choice, applied consistently across every reading, so your results are coherent from one module to the next.

The AI interprets — it never invents

This is the part most "AI astrology" gets wrong. Our engine decides what your chart actually says; the AI's only job is to put that into clear language. It will not invent events, relationships, dates, or biography. If the chart doesn't support a claim, the claim doesn't get made. That restraint is what lets a reading be both vivid and honest.

What we don't claim

Astrology is a lens for reflection, pattern, and timing — not fortune-telling or fact. AstroNoir readings are precise about the astronomy and disciplined about the interpretation, but they're for insight and entertainment, not a substitute for professional medical, financial, legal, or psychological advice. We'd rather be precise and honest than mystical and vague.

See the full astronomical inventory in What We Calculate, or how it all comes together in How It Works.