What is D-9 navamsa chart in vedic astrology and navamsa interpretation

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.

The lords of 1st, 4th and 7th navamsa of a sign represent the Deva ("Divine beings" and constructive forces); persons born with any of these navamsas rising in the Lagna are generous, religious, wealthy, powerful and influential. Persons born in the 2nd, 5th or the 8th navamsa whose lords represent the Naras ("Human beings" and their efforts) are generally kind, good natured, engaged in the pursuits of human welfare and reputed; and in the 3rd, the 6th or the 9th navamsa whose lords represent the Rakshasas("Demonic beings" and evil forces) are selfish,cruel, violent, destructive and possess many negative qualities. Moreover, the Lagna-rasi and the Lagna-lord should not form or occupy the 6th, the 8th or the 12th bhava in the Navamsa Chart nor the lords of the 6th, the 8th or the 12th of the Rasi Chart associate with the Navamsa Lagna or its lord.

In the Jaimini System of prognostication the use of seven karakas determined according to the respective longitudes of the seven planets is recommended and their navamsa-occupation noted. Any planet can acquire any karakatwa but the prime indicator is the Atmakaraka along with the various lagnas and padas.