Your navamsa with both signs on every row, vargottama planets marked, and the D9 ascendant that moves thirteen times faster than your rising sign. All sixteen Parashara divisions in the dropdown.
Lahiri sidereal · D30 and D2 use their real unequal rules, not equal slices · checked against two outside engines
Take a planet at 14°20' of Taurus. Taurus runs 30 degrees, and the navamsa cuts it into nine parts of 3°20' each. That planet sits in the fifth part. The rule then says where the count starts: for an earth sign it starts at Capricorn, so the fifth part from Capricorn is Taurus — the planet is vargottama, in the same sign twice. Fire signs count from Aries, air from Libra, water from Cancer. That is the entire construction, and everything the D9 is read for rests on it.
The consequence worth noticing is speed. A birth ascendant moves through one sign in about two hours. The navamsa ascendant moves through one sign in about thirteen minutes, because nine of them are packed into the same span. This is why the D9 is the chart that punishes a rounded birth time, and why twins born twenty minutes apart can share a rising sign and not share a navamsa lagna.
Look at the navamsa sign of each planet next to its birth sign, which is why both are printed on the same row. A planet that keeps its sign is vargottama and is marked. A planet that lands in a sign it rules or is exalted in has more to work with than the birth chart alone suggested; one that falls into its sign of debility has less, whatever it looked like at birth. This is the D9's real job in a reading — not a second set of predictions, but a second opinion on the first set.
The seventh house of the navamsa, and the sign its lord occupies, is where the marriage reading sits. The ninth of the D9 is often read for the deeper motivation behind a life. Neither of those is a forecast, and nothing on this page is going to tell you when you will meet someone.
The dropdown holds the standard shodashavarga, the sixteen divisions of Parashara: D1, D2, D3, D4, D7, D9, D10, D12, D16, D20, D24, D27, D30, D40, D45 and D60. They are computed the same way — cut the sign into n parts, apply the rule for where the count begins — but the rules differ per division and two of them are genuinely irregular. The D30 has five parts of 5, 5, 8, 7 and 5 degrees rather than thirty equal ones, and the D2 splits each sign in half between two lords rather than two signs. Software that treats every division as equal slices gets both of those wrong, which is one reason divisional charts have a reputation for disagreeing between programs.
The ninth harmonic of your birth chart. Each of the twelve signs is cut into nine parts of 3°20', and whichever part a planet occupies is mapped onto a new sign. The result is a second twelve-sign chart built entirely from the first one — no extra astronomy, just a finer cut of the same positions. In Vedic practice it is read alongside the birth chart rather than instead of it.
Because that is the tradition's main use of it, though it is not the whole use. The D9 is also treated as the test of a planet's real strength: a planet that looks well placed at birth but falls apart in the navamsa is considered to promise more than it delivers, and the reverse holds too. Marriage is read from it because the seventh house of the D9 refines what the seventh house of the birth chart only sketches.
A planet that occupies the same sign in the birth chart and in the navamsa. The word means 'best of the divisions'. It is read as a planet that is consistent — what it shows on the surface is what it is underneath — and it is treated as a real strength regardless of whether the sign itself is comfortable for that planet. This page marks vargottama planets automatically, because it is the one D9 feature that is easy to miss by eye.
For the planets, no more than for a birth chart. For the navamsa ascendant, yes, and more than usual: the D9 lagna changes roughly every twelve to thirteen minutes of clock time, against about two hours for the birth ascendant. An error of half an hour that leaves your rising sign untouched can still move the navamsa ascendant by two or three signs. Without a time this page leaves the D9 lagna and the houses out rather than printing a number it cannot stand behind.
Almost always the ayanamsha or the birth time. This page uses Lahiri, which is the Indian government standard and the most common choice, but Raman and Krishnamurti sit roughly a degree away and a degree is a third of a navamsa part. If the other site agrees on the ayanamsha and still disagrees, compare the sidereal degrees of the planets first — the divisions themselves are arithmetic and rarely where the difference is.
Each varga is read for one area. D10 for career, D7 for children, D4 for property, D12 for parents, D16 for vehicles and comfort, D20 for spiritual practice, D24 for learning, D30 for difficulty, D60 for fine detail. This page computes all sixteen of the standard set, but the honest advice is that D1, D9 and D10 carry most of the weight in practice, and the very high divisions demand a birth time accurate to the minute before they mean anything.