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AstralMath
Compute my chart

Birth Chart Calculator

Your complete natal chart — planets, houses, aspects, and nakshatras — computed from the real sky to arc-second precision. Nothing looked up. Everything calculated, on your device.

City lookup runs in DuckDB-WASM, in your browser. Or enter coordinates below.

±1″
Arc-second precision
9
Planets + nodes
27
Nakshatras resolved
0
Data sent to a server

How the calculation works

We convert your local birth time to Universal Time, compute the Julian Day, then ask Swiss Ephemeris for each body's ecliptic longitude — the same call an observatory-grade tool makes. For the sidereal system we apply the Lahiri ayanamsa; for tropical we don't. Houses come from the ascendant and midheaven for your exact latitude and longitude. Aspects are the measured angular separations between bodies, flagged when they fall within orb.

The result you leave with isn't just a picture — it includes the dasha period you're in right now, so a chart becomes a next step. That's the point: exact astronomy, turned into something you can act on, with the numbers shown.

Read the method →See your timing →

References

  1. [1]Swiss Ephemeris — Astrodienst AGThe high-precision ephemeris AstralMath compiles to WebAssembly and runs unmodified.
  2. [2]JPL Development Ephemeris (DE431 / DE441) — NASA Jet Propulsion LaboratoryThe underlying planetary/lunar ephemeris Swiss Ephemeris is fit to.
  3. [3]Lahiri Ayanamsa (Indian Calendar Reform Committee, 1955) — Rashtriya Panchang, Government of IndiaThe standard sidereal offset AstralMath uses for the Vedic system.
  4. [4]Nakshatra (lunar mansions) — Reference overview27 divisions of the ecliptic; the spine of Vedic timing.