yk***@gmail.com
You addressed all the concerns I had been thinking about.
Deterministic logic first. AI explanation next.
Each tool begins with declared inputs and deterministic rules. Birth-chart systems keep their calculated structure visible; AI explains those results without rewriting the underlying facts.
How a result is produced
3 steps- Structured inputs
Birth details, questions, selections, or cast inputs are normalized for the relevant tool.
- Rules engine first
Each tool produces its chart, draw, cast, or core facts from its declared rules.
- AI explanation
AI interprets the visible facts and structure without changing the deterministic inputs.
Core analysis journeys
Bazi Analysis
Interpret the Day Master, Ten Gods, Five Elements, and Luck Pillars while keeping chart facts separate from reflective guidance.
Ziwei Dou Shu
Interpret the Life and Body Palaces, palace relationships, stars, Four Transformations, decade cycles, and annual cycles without mixing chart facts with explanation.
Astrology
Read the Sun, Moon, Rising sign, planetary placements, houses, and major aspects while keeping chart data separate from interpretation.
Combined Reading
Compare 2-3 independently calculated systems axis by axis. Similar themes add perspective but do not establish empirical reliability.
Vedic Astrology
Read the lagna, Moon nakshatra, divisional charts, and dasha periods while keeping calculated chart data separate from interpretation.
Human Design
Understand your natural rhythm, decision timing, and pressure pattern in plain language, with practical guidance for work, relationships, and this week.
Sukuyo Reading
Start with a calculated Shukuyo birth mansion and explore the traditional 27-mansion themes without turning symbolism into certainty.
More ways to begin
Free online divination tools: six ways to begin
Compare Tarot, Meihua I Ching, Liu Yao, Lenormand, Qimen Dunjia, and Guanyin lots by how each begins and what it helps you examine. Every method shows its fixed result before any optional AI reading.
Independent experiences
BZTI Archetype
Generate a Bazi archetype card and inspect chart-signal consistency; the result is reflection, not diagnosis or measurement.
Huangli
Look up Huangli fields while keeping calendar data separate from traditional interpretation.
Daily Fortune
Compare symbolic daily themes and time windows, then verify real conditions before acting.
OpenFate Editorial
From core concepts to practical interpretation
Editorial research on Bazi, relationships, wealth, annual timing, and Eastern metaphysics.
Open Source · MCP · Agent Skill
OpenFate Bazi MCP Server
A production-grade Bazi calculation server for Claude, Cursor, Codex, Cline, and every MCP-compatible AI agent.
npx -y @openfate/bazi-mcp
Frequently Asked Questions
Everything you need to know about reports, credits, and how it works.
Credits & Account
Usage & Features
Charting & Algorithm Logic
Technical & Developers
Troubleshooting
Privacy & Legal
About Me
What does the free birth chart calculator show?
Enter your birth date, recorded local time, and birthplace to create a natal chart without signing up. The result shows the Sun, Moon, Rising sign when time is reliable, planetary positions, houses, and major aspects. OpenFate calculates the chart first and keeps optional AI interpretation as a separate step.
What the chart includes
- Core placements: Sun, Moon, planets, Ascendant, Midheaven, and house positions when the birth time supports them.
- Chart structure: zodiac signs, 12 houses, house cusps, and major planetary aspects.
- Calculation context: recorded local time, location, time zone, birth-time reliability, tropical zodiac, and Placidus houses.
Best for
- People looking for a free birth chart calculator before requesting a reading.
- Anyone checking a Sun, Moon, and Rising combination or comparing natal chart results.
- Readers who want calculated placements kept separate from AI-assisted interpretation.
How the Free Birth Chart Calculator Builds a Natal Chart
A birth chart calculator starts with a local birth date, time, and place. It converts those inputs into planetary longitudes, angles, houses, and aspects. The result is easier to verify when the time-zone conversion, birth-time reliability, zodiac, and house system are visible.
OpenFate stores the rule-based chart before adding any AI explanation. Matching birth data should be compared under the same calculation settings, especially when a placement lies near a sign or house boundary.
1. Enter the birth date, local time, and birthplace
Use the date and local clock time from the birth record. Add the birth city or coordinates. The location supplies latitude and longitude. The date and place establish the historical time zone and daylight-saving rules.
2. Inspect the calculated placements and chart structure
The chart displays the Sun, Moon, planets, zodiac positions, and major aspects. When the birth time supports them, it also shows the Ascendant, Midheaven, 12 houses, and house cusps. These calculated fields are the evidence layer for any later reading.
3. Treat birth-time reliability as part of the result
The Ascendant and houses move quickly and depend on time and location. When the birth time is unknown or approximate, retain that uncertainty rather than presenting time-dependent placements as established facts.
4. Compare the zodiac, house system, and ephemeris settings
OpenFate's current Western chart uses the tropical zodiac, Placidus houses, and Swiss Ephemeris calculations. Other calculators may use sidereal positions or another house system. They may also use different node and rounding rules. Compare the settings before judging a difference.
5. Keep chart calculation separate from interpretation
The calculation engine creates the chart from birth inputs and declared settings. AI can organize those existing placements into readable explanations. It does not supply missing birth facts or make the symbolic interpretation scientifically predictive.
- Verify the birth record and local clock time.
- Check the time zone, daylight-saving context, zodiac, and house system.
- Lower confidence in angles and houses when the time is uncertain.
- Compare chart facts before comparing written interpretations.
Birth chart calculator FAQ
Answers about free chart creation, required birth data, Rising signs, unknown birth times, settings, calculator differences, and AI interpretation.
Is the birth chart calculator free and available without sign-up?
Yes. You can create and inspect the basic natal chart without signing up. AI interpretation and follow-up questions are a separate step and may require an account and reading credits.
What information does a birth chart calculator need?
Use the birth date, recorded local clock time, and birthplace. The place identifies latitude, longitude, time zone, and historical daylight-saving context needed for angles and houses.
Can I calculate a birth chart without an exact birth time?
You can still inspect some planetary signs, but the Ascendant, Midheaven, and houses cannot be confirmed reliably. Do not enter noon or midnight just to produce a complete-looking chart; preserve the uncertainty.
Is the Rising sign the same as the Sun or Moon sign?
No. The Sun and Moon signs come from those bodies' zodiac positions. The Rising sign is the sign on the eastern horizon and changes with birth time and place, which is why accurate local time matters.
Why do two birth chart calculators show different results?
First check the recorded time, coordinates, time zone, and daylight-saving conversion. Then compare the tropical or sidereal zodiac, house system, node setting, ephemeris, and rounding rules. Align the inputs and settings before comparing results.
Which astrology settings does OpenFate use?
The current Western astrology engine uses the tropical zodiac, Placidus houses, and Swiss Ephemeris planetary calculations. The chart also records birth-time precision so time-dependent fields can be treated with the appropriate confidence.
Does AI calculate or change the natal chart?
No. The chart engine calculates the placements, angles, houses, and aspects first. AI can explain that stored output later, but it should not invent a birth time or freely rewrite the calculated chart.