Exact astronomy · Labelled interpretation
Where the math ends and belief begins.
The honest answer to “is astrology real?” has two halves. The astronomy is exact, measured physics. The interpretation is a symbolic tradition. AstralMath refuses to blur them — here is precisely what we compute and what we don’t.
What is exact
Everything about position is exact. Given a date, a time, and a place, the location of every planet on the ecliptic is a solved problem in celestial mechanics. AstralMath answers it with Swiss Ephemeris, which is derived from NASA JPL’s DE431 numerical integration of the solar system.
The result is accurate to roughly one arc-second — 1/3600 of a degree — across a date range from 13201 BCE to 17191 CE. Ascendants, house cusps, aspect angles, nakshatra boundaries, dasha proportions, solar-term instants: all of it is arithmetic over these positions. Nothing here is looked up in a table or softened for effect. It is the same computation research and observatory software runs.
What is interpreted
Everything about meaning is interpretation. That a planet sits at 14° of a sign is a fact; that the placement signifies something about your career or your marriage is a claim made by a tradition, not a measurement. These symbolic systems are old, internally coherent, and culturally deep — but they are not physics, and we will not present them as prediction.
So AstralMath draws the line on the page. We show you the exact numbers, then show the interpretation beside them, labelled as interpretation. You can accept it, discard it, or read it as one tradition’s language for a pattern — with the arithmetic that produced it always visible.
Sidereal vs tropical
The most common “astrology can’t even agree with itself” objection is really a precise, answerable astronomy question. The tropical zodiac fixes 0° Aries to the northern vernal equinox. The sidereal zodiac fixes it to the fixed stars.
Earth’s axis precesses — it wobbles a full circle over about 25,800 years, roughly one degree every 72 years. So the two zodiacs, aligned two millennia ago, have drifted about 24° apart. That offset is called theayanamsa, and it is a measured quantity, not a matter of opinion. The Western tradition works tropically; the Vedic tradition works sidereally with theLahiri ayanamsa. AstralMath computes either exactly — the disagreement is a definition, not an error.
How we compute it
The engine is Swiss Ephemeris compiled to WebAssembly and shipped to your browser. When you enter your birth details, the calculation happenson your device. Your date, time, and place are never uploaded; there is no account and no server round-trip for the math. You can open the network tab and watch nothing leave.
That is the whole method: exact astronomy from a real ephemeris, interpretation labelled as interpretation, and the computation run where you can see it. Everything else on the site is built on this one honest foundation.
Method questions
Is the astronomy in AstralMath actually accurate?+
Yes. Planetary positions come from Swiss Ephemeris, derived from NASA JPL’s DE431 ephemeris, accurate to roughly one arc-second across a date range from 13201 BCE to 17191 CE. We compile it to WebAssembly and run it unchanged, so the coordinate geometry is not approximated.
Does the interpretation predict my future?+
No, and we never claim it does. Interpretation is a symbolic tradition built by cultures over centuries. AstralMath labels it as interpretation and shows the exact positions it was derived from, so you can judge it yourself rather than being sold certainty.
What is the difference between sidereal and tropical?+
The tropical zodiac fixes 0° Aries to the vernal equinox; the sidereal zodiac fixes it to the stars. Because Earth’s axis precesses about one degree every 72 years, the two have drifted roughly 24° apart. The gap, called the ayanamsa, is a measured astronomical quantity — AstralMath uses the Lahiri definition for sidereal work.
Is my birth data sent anywhere?+
No. The engine runs entirely in your browser via WebAssembly. Your birth date, time, and place are used locally to compute your chart and are never transmitted to a server. There is no account.
See the exact numbers for yourself
Enough about the method — run it. Compute your chart from the real ephemeris and read the positions the interpretation is built on.