CrescentWhat a divisional chart is for, and when to stop looking at one
A varga is a magnifying glass on one department of life. It is not a second horoscope, and treating it like one is how readings go wrong.
People discover the navamsa and immediately start reading it as though it were a separate chart with separate news. It is not. A divisional chart has no independent life; it is a way of asking how strong something in the main chart really is.
How they are made
Take a sign, thirty degrees wide, and cut it into equal parts. Nine parts gives you the navamsa, the D9. Ten gives the dashamsha, the D10. Then map each part onto a sign by a fixed rule. A planet's varga sign is simply which slice of its sign it happens to occupy.
That is the whole mechanic. Everything else is interpretation.
What each one is asked
The D9 is consulted for marriage, and more broadly for the underlying strength of every planet: a planet that is weak in the main chart but well placed in the navamsa tends to deliver late rather than never. The D10 is asked about career and public standing. The D7 about children, the D4 about home and property, the D12 about parents.
You consult the varga that matches the question. Reading the D10 to answer a question about marriage is a category error, and it will still produce an answer, which is the dangerous part.
When to stop
The main chart decides whether something is promised. The divisional chart only tells you how strongly, and the dasha tells you when. If nothing in the main chart supports an outcome, no amount of digging into the D60 will conjure it.
This is the discipline that separates a reading from a fishing expedition. Sixteen divisional charts multiplied by nine grahas is a hundred and forty four placements, and if you look at all of them you will find something to say about anything. Decide the question first, pick the one chart that answers it, and close the rest.