If you only ever learn one divisional chart beyond the birth chart itself, it should be this one. The Navamsha doesn't just show your marriage — it shows how much of what your D1 promises was actually earned.
Navamsha divides every 30-degree sign into nine equal parts of exactly 3°20' each. The classical counting rule depends on the sign's nature: movable (chara) signs start the count of their nine parts from the sign itself; fixed (sthira) signs start from the 9th sign counted from them; and dual (dwiswabhava) signs start from the 5th sign from them. Nine, in this system, is tied to completion and fruition — nine months of gestation, nine planets (grahas), the sense of something fully ripened — which is exactly why this varga is used to judge how fully a planet's promise in the D1 actually comes to fruition in lived experience.
The D9 has two overlapping classical uses. First, and most famous: marriage and the spouse, read from the D9 lagna, its 7th house, and the placement of Venus and Jupiter (the natural karakas for spouse, in a female and male chart respectively, per classical assignment) within it. Second, and arguably more foundational: the D9 is treated as the single best gauge of a planet's genuine underlying strength (referred to as its bala or shad-bala more broadly) — a planet can look powerful by sign placement alone in the D1, but the D9 is where astrologers check whether that strength is real or superficial.
Vargottama, illustrated: this planet occupies the identical sign in both the D1 and the D9 — the same house position shown here for clarity.
Vargottama means a planet occupies the exact same sign in both the D1 and the D9 — nothing more exotic than that — and it is read as a strength: that planet's significations tend to be unusually stable, consistent and genuinely earned rather than merely promised. The opposite pattern — a planet exalted in the D1 but debilitated (or otherwise weakened) in the D9 — is read as a promise that is real on the surface but will take conscious work to fully realize; the person may need to actively earn what the D1 alone seemed to hand them. This is precisely why a chart is never read from the D1 in isolation: the D9 tells you how much of the D1's promise has already been "cashed in."
Suppose the D1's 7th lord (marriage) sits exalted, suggesting an easy, fortunate partnership. If that same planet falls into a weak or afflicted sign in the D9, the reading isn't "no marriage" — it's that the relationship's real, lived quality will ask more of the person than the D1 alone suggested: more communication, more compromise, more conscious effort to keep what looked effortless on paper. Conversely, a 7th lord that looks only average in D1 but is vargottama or strongly placed in D9 often points to a marriage that turns out steadier and more fulfilling than the birth chart alone would predict.
The D1 tells you what you were given. The Navamsha tells you what you've actually earned.
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Navamsha means "ninth division" — the D9 chart, formed by splitting each 30-degree sign into nine equal parts of 3°20' each.
Vargottama means a planet occupies the exact same sign in both the D1 birth chart and the D9 Navamsha (or, more generally, any varga being checked). It is considered a mark of strength and stability for that planet — not a weakness, and not the reverse of a good placement.
Marriage and the spouse are its most famous use, but the D9 is equally important as the primary check on a planet's genuine, underlying strength across all areas of the chart — which is why it's treated as almost a second birth chart.
It suggests the planet's promise is real but not automatic — the person will likely need to put in conscious effort to fully realize what that placement offers, rather than experiencing it effortlessly.
Always after. The D1 gives the first, overall picture of the life; the D9 is then used to confirm, refine or add nuance to specific D1 findings — never as a standalone chart read in isolation.