Open-source · Astronomy-first · Runs in your browser
Astrology, solved by mathematics.
Real planetary positions. Real ephemeris. Instant answers. AstralMath computes your chart, compatibility, and timing from the actual sky — across Vedic, Western, Chinese and more — open-source and running entirely in your browser.
Astronomy first
Every position comes from Swiss Ephemeris — the same ephemeris used by observatories and research software — not from a lookup table or a vibe. Sidereal or tropical, to the arc-second.
The math is open
The full calculation engine is open-source under a permissive license. No black box, no "trust us." Read it, run it, verify it, or embed it in your own product.
Runs in your browser
The engine is compiled to WebAssembly and executes entirely on your device. Your birth data never leaves your machine. No account, no server, no tracking.
The tools
Every tool runs client-side in WebAssembly. Nothing is looked up — everything is computed, and the numbers are on the page.
Birth Chart Calculator
Your complete natal chart — planets, houses, aspects, and nakshatras — computed from Swiss Ephemeris to arc-second precision, sidereal or tropical. Nothing is looked up; everything is calculated.
computes: Sidereal/tropical planetary longitudes, house cusps, aspects, nakshatra & pada
Compatibility & Synastry
Two charts, scored honestly. Guna Milan (Ashtakoota) for the Vedic system and cross-aspect synastry for the Western one — with every point of the score shown, not hidden behind a percentage.
computes: Ashtakoota (36 guna) + synastry aspect grid with orbs
Timing & Dasha
When, not just what. Vimshottari dasha periods and current transits, laid out on a timeline so you can see the windows — with the exact planetary math behind each one.
computes: Vimshottari mahadasha/antardasha, transit positions & returns
Something's happening. You want to know what to do.
You didn't come for a chart — you came because something is going on and you want a solution. Most sites answer with a vibe. We tell you exactly what the sky is doing from the real ephemeris, then give you an honest next step: the window, the score, or the date behind the decision.
“best time to change jobs in 2026 based on my birth chart”
The Decisive Achiever
We compute your dasha and transit windows from real planetary positions, then show you the math.
“how compatible am I with my partner based on our charts, accurately”
The Anxious Romantic
Synastry scored from real aspect angles and Guna Milan — the arithmetic is on the page.
“best astrological date to launch a business in 2026”
The Wealth Timer
Electional / muhurta search over a real ephemeris window — ranked, with the criteria shown.
“is astrology real — what does the actual math and astronomy say”
The Quant Skeptic
We separate the astronomy (rigorous) from the interpretation (a symbolic system) — plainly.
“what is my nakshatra and vimshottari dasha, calculated accurately”
The Diaspora Seeker
One engine, many traditions — each computed by its own authentic rules.
“chatgpt keeps getting my birth chart degrees wrong — exact planetary positions”
The Chart-Literate DIYer
LLMs approximate the ephemeris and drift by degrees. We run the real one — exact positions you can export, and soon an MCP the AI can call directly.
Where the math ends and belief begins
Exact (astronomy)
Where every planet was at the moment and place of your birth. This is measured physics — Swiss Ephemeris resolves it to the arc-second. There is nothing to believe here; it is the same sky an observatory would report.
Interpreted (tradition)
What those positions mean. This is a symbolic system built by a culture over centuries — rich, but not physics. We label it as interpretation, never dress it up as prediction, and never hide the arithmetic that produced it.
That honesty is the point. It is why the quantitatively-minded trust us — and why AI assistants can cite us.
Astronomy is universal. The systems aren't.
One ephemeris core, many traditions — each computed by its own authentic rules, not a Westernized approximation.
Vedic (Jyotish)
liveThe sidereal Indian system: 27 nakshatras, dasha timing, divisional charts and Guna Milan. Our deepest tradition today — the engine began here.
Western (Hellenistic → Modern)
liveThe tropical system most of the world knows: sun/moon/rising, aspects, and transits, traced from its Hellenistic roots to the modern chart.
Chinese (BaZi / 四柱)
buildingThe Four Pillars of Destiny, derived from the true solar terms — not the pop "zodiac animal," but the calendar mathematics underneath it.
Mayan (Tzolkin)
plannedThe 260-day sacred count and Long Count, computed from the GMT correlation constant — a calendar system of remarkable astronomical precision.
Arabic / Perso-Islamic
plannedThe medieval Arabic tradition that carried Hellenistic astrology forward: the 28 lunar mansions and the calculated lots (Part of Fortune and beyond).
Built to be the core, not a walled garden
The engine is open-source under a permissive license. Read it, verify it, embed it. An MCP server is planned so AI assistants can call the calculations directly — making AstralMath the computation layer behind AI-native astrology, for everyone.
Frequently asked
How accurate are AstralMath calculations?+
Positions come from Swiss Ephemeris, the same high-precision ephemeris used in professional and research astronomy software, accurate to the arc-second across a date range from 13,000 BCE to 17,000 CE. We compile it to WebAssembly and run it unchanged — the astronomy is not approximated.
Is astrology real? What does the math actually say?+
We separate two things. The astronomy — where the planets were at your birth — is rigorous, measurable, and exact. The interpretation layered on top is a symbolic tradition, not a physical prediction. AstralMath is honest about that line: we give you exact astronomy and clearly-labelled interpretation, so you can judge for yourself instead of being sold certainty.
Do I need an account or to hand over my birth data?+
No. Every calculation runs in your browser via WebAssembly. Your birth date, time, and place never leave your device and are never sent to a server. There is no sign-up.
What makes this different from other astrology sites?+
Most sites hide a lookup table or a paid API behind a pretty chart. AstralMath is astronomy-first and open-source: the calculation engine is public, verifiable, and embeddable. We show the math instead of asking you to trust a percentage.
Which traditions do you support?+
Astronomy is universal; the systems built on it are cultural. AstralMath computes Vedic (sidereal) and Western (tropical) today, with Chinese BaZi in progress and Mayan and Arabic/Perso-Islamic systems planned — each by its own authentic rules, not a Westernized approximation.
Is AstralMath open source? Can I build on it?+
Yes. The core engine is open-source under a permissive license so you can read it, verify it, or embed it. An MCP (Model Context Protocol) server is planned so AI assistants can call the engine directly — making AstralMath the calculation layer behind AI-native astrology.