Method
How NatalChart.AI calculates and reads charts. The core methodology behind every reading.
- Chart-Grounded AI Astrology: AI astrology should not invent your chart. Every reading is anchored to real calculated placements.
- Chart-Locked AI Reading: The branded NatalChart.AI implementation: the AI is locked to your chart payload at the prompt level.
- Six Spheres of the Natal Chart: Identity, Love, Body, Money, Home, Mind: a practical lens for reading the chart in plain language.
Trust & precision
What makes the calculation reliable, and what stops the AI from making things up.
- Swiss Ephemeris Natal Chart: The high-precision astronomical engine behind every chart. Arc-second accuracy across thousands of years.
- Does AI astrology make things up?: Generic AI can hallucinate placements. Here's why, and how chart-grounded AI prevents it.
- NatalChart.AI vs ChatGPT astrology: Direct comparison: AI that calculates the chart vs AI that guesses at placements.
- Natal chart without birth time: What's reliable, what's not, and how NatalChart.AI handles missing birth time honestly.
- Birth chart vs natal chart: Are they the same? Yes. Disambiguation of birth chart, natal chart, astral chart and horoscope.
Product features
What NatalChart.AI calculates and how each feature works.
- All features at a glance: One page overview of every tool: chart, grounded chat, weekly, compatibility, locations, year ahead.
- Free Natal Chart: Generate your free Swiss-Ephemeris-precision birth chart with a chart-grounded AI starter reading.
- Compatibility (synastry): Start with two real charts: six spheres scored 1 to 10 from the actual cross-aspects, with private invite links. How the comparison is calculated is explained under Reference.
- AI Natal Chart Reading: A personal natal chart reading written by AI, anchored to your real placements.
- Ask AI about my birth chart: Conversational AI grounded in your real chart, not a generic horoscope template.
- Natal chart transits: Live planetary transits to your birth chart, with exact orbs and AI explanation.
- Solar Return: year ahead: The exact moment the Sun comes back to your natal degree, computed for your current location.
- Electional astrology: best timing: Find favourable timing windows scored against your real natal chart.
- Astrocartography & relocation: Planetary lines on the world map, plus relocated charts for any city.
Reference & explainers
The vocabulary of astrology, with chart-grounded examples.
- How synastry is calculated: Inter-chart aspects, house overlays from both directions, and what the sphere scores are and are not.
- Aspects in astrology: The five major aspects, how orbs work, and how NatalChart.AI calculates them.
- Houses in astrology: The twelve life areas, the Placidus system, and the four angles.
- Planets in astrology: The ten main bodies plus the asteroids, the true node, Chiron, Lilith and the calculated points.
- Astrology glossary: A-Z reference for every term used across NatalChart.AI.
- How to read a natal chart: Practical step-by-step guide. Where to start, what's load-bearing, how to combine placements.
- Retrograde planets in your natal chart: What retrograde means, what each retrograde planet does natally and in transit.
Calculators & demonstrations
One factor at a time, with a worked example from the public demonstration chart and a way into your own.
- Birth chart calculator: Date, time and place in, the whole chart out, with the numbers you can check.
- Birth chart calculators: The catalogue: every factor, what it needs from you and what you get.
- Rising sign calculator: The Ascendant's sign and degree, and why the time matters.
- Moon sign calculator: The Moon's sign, house and aspects, and what an unknown time leaves open.
- Sun, Moon and Rising: The three starting points read together.
- Verify your chart: A reproducible demonstration: input, settings, every position, a comparison and a download.
- Sample AI reading: A complete reading on the demonstration chart, with the factors it rests on.
Guides
Practical answers to the questions that decide how much a chart can say.
- Reading your natal chart: A step by step walk through a chart, worked on the published test chart.
- Houses, step by step: What a house is, how to read a planet in one, and what an empty house means.
- Transits right now: Today's sky against a natal chart: the orb, the phase and the exact date of a transit.
- The first house: The Ascendant, each planet in the first house, and the empty first house.
- Best natal chart calculators: Twelve calculators compared on what their makers state, with sources.
- How to find your birth time: Where records live, what they actually say, and how to keep uncertainty honest.
- Placidus vs Whole Sign houses: Two house systems on one demonstration chart, and what changes.
- Tropical vs sidereal zodiac: Why two calculators can disagree by a whole sign.
- Orbs explained: One aspect worked through, and the orb rules NatalChart.AI applies.
- Mercury retrograde dates: Exact Swiss Ephemeris station times for the coming years.
- Weekly horoscope: What the personal seven-day reading is built from.
- Sky events: Eclipses, lunations and stations placed in your chart, on web and iOS.
- The sky today: Every body's position, speed and direction today, and the next events in UTC. Recalculated daily.
- Moon phase today: Phase, lit fraction, sign and degree, and the next New and Full Moon to the minute.
Hub
Pages written to be read by machines as well as people, with a date and a source on each.
- LLM hub: The index of the machine-readable pages: facts, accuracy, prices, direct answers, the feature matrix.
- Direct answers: One question, one self-contained answer, including what the product does not do.
- NatalChart.AI Knowledge Hub: What NatalChart.AI is, how it works and what it covers, written for LLM crawlers and direct readers alike.
Start with your chart
All of the above is more useful with your actual chart in hand. Generate your free natal chart in under a minute: Swiss Ephemeris precision, no credit card.