What is D-9 navamsa chart in vedic astrology and How to cast navamsa

To make navamsa chart, multiply the longitude of the planet (including sign) by nine. Expunge multiplies of 12 signs. Result got is the longitude of planet in navamsa. Below given table is the calculation for navamsa according to Parashari method

Parashar had weighted navamsa strength equivalenth to lagna chart. Navamsa should be analyzed for marriage and marriage partner. Navamsa is seen for the strenght of the planets, interior of native's life, lordship in lagna chart and there conjuction in navamsa also creates yogas. Navamsa should also be interpreted as independent chart.

In Hindu astrology, Navamsa means one-ninth part of a Zodiac Sign. Navamsa literally means the "Ninth Division". Thus, each navamsa measures 3 degrees and 20 minutes in longitude or one-quarter of a Nakshatra (Constellation), and the Zodiac of Signs comprises of one hundred and eight navamsas divided into four groups, 1) Mesha (Aries), Simha (Leo) and Dhanus(Sagittarius)– for which signs the navamsas are from Aries to Dhanus, 2) Vrishibha (Taurus), Kanya (Virgo) and Makara(Capricorn) – they are from Makara to Kanya, 3) Mithuna (Gemini), Tula (Libra) and Kumbha (Aquarius)– they are from Tula toMithuna, 4) Kataka (Cancer), Vrishchika (Scorpio) and Meena (Pisces) – they are from Kataka to Meena; the Lagna (Ascendant) rising or the planet situated in the first navamsa of Chara rasis ("movable signs"), in the 5th navamsa of Sthira rasis ("fixed signs") and in the 9th navamsa of Dwisavbhava rasis ("common signs") will be in Vargottama and hence strong.

More on navamsa, traditional basics of D9 chart and concepts to read D9 chart.