If you have had a Western chart read, you know how it usually goes: an astrologer looks at your placements and tells you what they mean, and the authority is theirs. This works the other way around. Your chart is read against one centuries-old Sanskrit text, the Brihat Parashara Hora Shastra — 4,197 verses across 62 chapters, which we entered by hand and turned into 2,103 rules a computer can test. Every sentence in your reading goes back to a verse, and most of those verses lead to the page where they were printed over a century ago, so you can check us.
Here is one verse making that trip, what happens to your chart, and the list of things this cannot do. AstroEngine is one of the experiments of Prayogsala, the record I keep of trying things in public and writing down what happened. The rule there holds here: show the working.
From a printed page to a rule a computer can test
Take one verse from the chapter on the twelve houses. In the Bombay printing of 1899, a public-domain copy scanned by Nepal Sanskrit University, it sits near the top of its page:
लग्नेशे भाग्यराशिस्थे भाग्येशे लग्नसंयुते । गुरुणा संयुते द्यूने धनवाहनलाभकृत् ॥
In plain English: if the ruler of the rising sign is in the 9th house, the ruler of the 9th is in the rising sign, and Jupiter is in the 7th, it brings gain of wealth and vehicles17.208.
The first job was to be sure of the words. We compared each verse across every printing of the text we could find, most of them scanned on the Internet Archive, and where the printings disagree we wrote the difference down instead of choosing quietly.
The second job was to read the verse as a rule. This one has three conditions, and all three have to hold:
- the ruler of the 1st house stands in the 9th;
- the ruler of the 9th house stands in the 1st;
- Jupiter stands in the 7th.
The rule the engine keeps says exactly that, in a form a program can test, along with what the verse says follows — gain of wealth and vehicles — the fact that the text counts it as good, and the verse it came from. Two conditions out of three is not the rule. The engine does not round up. A person reading charts at the end of a long day might; that is the whole reason to build a machine for this part.
Some verses are not about events at all. The line that says the ninth-part chart, the navamsa, is read "of the spouse"8.3 tells the engine which chart to open for which question. Verses like that shape a reading without ever appearing in it as a prediction.
What actually happens to your chart
The chart is cast from your date, time and place in the sidereal zodiac, with the Lahiri ayanamsa and whole-sign houses. If that sentence means nothing to you yet, the short version is that the signs here are measured against the stars rather than the seasons, which is why your Vedic sign is often the one before your Western one, and why the houses are whole signs rather than slices measured from the degree of your ascendant.
Then the engine works through the rules, one at a time. In the sample reading on our home page it checked 1,513 rules against one chart. 227 of them held. Those 227 rest on 99 verses, and the finished reading runs to 61 pages. The numbers change from chart to chart, because a rule only enters a reading if every one of its conditions is met.
It also weighs what it finds. Not every rule that holds counts the same: a planet's strength, its dignity and the rules standing around it all change how much a finding matters. Where two findings pull against each other, the engine weighs one against the other, the way the text does itself when it reads the years of a strong Saturn and of a weak Saturn in opposite ways.
Then the words. A language model writes the findings as plain English, because a list of verses is not a reading. It cannot add a finding. Every paragraph is checked back against your chart before it is sent, and each one ends with the verse it came from. A reading that does not pass that check is held for a person to look at before it goes out.
What this cannot do, in plain terms
This is the part most pages leave off, so it gets its own list.
It cannot say what the text does not say. Some of the best-known ideas in modern astrology are not in this book at all. Kaal Sarp Dosha is one — we searched every verse and found nothing — and the same is true of Sade Sati. When your question falls outside the text, the reading says so instead of borrowing an answer from somewhere else.
It does not hide the hard verses. The book is blunt in places, and a reading that gives only the kind half is not telling you what the book says. Where a hard verse applies, it comes with the conditions it belongs to and whatever the text says softens it, the way whether Saturn is always bad handles it. The text also discusses lifespan; we leave that out of every reading.
It cannot settle every disagreement between the printings. Where they differ, the rule records which reading it follows and that another exists. In the one or two places where the engine has to lean on the later tradition, the reading labels it as the tradition's rather than the text's.
It cannot be more exact than your birth time. The rising sign moves through a whole sign in about two hours, and the finer charts change every few minutes. A reading from a guessed time is a reading of a slightly different chart.
It cannot tell you your future, and it does not try. The text describes tendencies and seasons in the language of its own age; the engine tells you what it says about your chart, for you to reflect on. That is not certainty, and it is not medical, legal or financial advice.
And it cannot link every verse to a printed page. The 1899 printing is an abridgement, so some verses are not in it. Those still carry their citation; they simply have no page to open.
Why we do not claim this is accurate
Something is missing from the list above: any claim that this works. We do not make one. What we can show is which verse a sentence came from, which conditions in your chart made it fire, and what the printed page looks like. You get to judge the rest, which is the honest position for anyone handling a text this old.
That is also why the citations are not decoration. If a line in your reading seems wrong, you can follow it to the verse, read the Sanskrit and the translation side by side, and see the page it was printed on. Most readings, Western or Vedic, cannot be audited at all.
Questions to sit with before you order anything
- When a reading tells you something, do you want to be told what it means, or shown where it came from?
- How precisely do you know your birth time, and from what — a certificate, a parent's memory, or a guess?
- Which parts of your own chart have you only ever heard interpreted, never sourced?
- If a verse written centuries ago reads your placement harshly, would you rather know, or not?
Common questions about how this works
How is a Vedic chart read differently from a Western one?
The signs are measured against the stars rather than the seasons, the houses are whole signs, and the Moon carries much of the weight the Sun carries in Western practice. The method here adds one more thing: each reading is checked against the verses of a single text.
Which text is it, and who wrote it?
The Brihat Parashara Hora Shastra, a centuries-old Sanskrit work attributed to the sage Parashara. Scholars date it differently and some treat it as a compilation, so we do not put an age on it.
Which edition do you use?
Every printing we could get, compared verse by verse. The one named in a reading is the public-domain Bombay printing of 1899, because that is the page you can open yourself.
Is a computer reading my chart, or a person?
The engine finds and weighs the rules; a language model writes them up and may add nothing; each paragraph is checked back against the chart, and a reading that fails is held for a person.
Does it predict events?
No. It reports what the text reads into a placement, in conditions, for reflection — not a forecast, and not advice on health, money or a legal matter.
Can I see the verses behind my reading?
Yes. Every paragraph ends with its verse, each verse appears in Sanskrit and English, and most carry a link to the printed page.
See it done on a real chart
If you'd like to try reading your own chart first, start with how to read your Vedic birth chart.
The honest way to judge any of this is to read a finished one. The sample on our home page is real, every paragraph cited, and yours is built the same way from your own chart.