Navamsa, Dwadasamsa and Trimsamsa

Navamsas : Each sign being divided into 9 equal parts and there being 12 such signs, there are in all 12x9 or 108 such divisions in the ecliptic. The ecliptic contains 27x4 or 108 stellar quarters or Nakshatrapadas; it follows therefore that a Navamsa is a Nakshatrapada, that is one fourth of a lunar mansion. The 108 Navamsas beginning from the first point of Mesha bear the same names as the twelve rashis of the Zodiac counted over and over again. 

Mesha, Simha, Dhanu begin with the Navamsa of  Mesha.

Vrishabha, Kanya, Makara begin with the Navamsa of Makara.

Mithuna, Tula, Kumbha begin with the Navamsa of Tula.

Kataka, Vrischika, Meena begin with the Navamsa of Kataka.



Dwadasamsas : Each sign being divided into 12 equal parts there are 144 dwadasamsas. They bear the same names as those of the 12 rashis. The name of the first Dwadasamsa of a particular rashi  is the name of the rashi itself. So that the 12 Dwadasamsas of Mesha are Mesha, Vrishabha, Mithuna, &c., ending with Meena. Those of Vrishabha are Vrishabha, Mithuua, Kataka, &c., ending with Mesha. Those of Mithuna are Mithuna, Kataka, Simha, &c., ending with Vrishabha and so on.

The Lord or Ruler of each navamsa and dwadasamsa is the rashi lord itself.


Trimsamsas : A trimsamsa is one degree of the zodiac.

In odd rashis ie. Mesha, Mithuna, Simha, Tula, Dhanu, Kumbha, the first 5 degrees are ruled by Mars, next 5 degrees are ruled by Saturn, next 8 degrees ruled by Jupiter, next 7 degrees ruled by Mercury and last 5 degrees ruled by Venus.


In even rashis ie. Vrishabha, Kataka, Kanya, Vrischika, Makara, Meena, the first 5 degrees are ruled by Venus, next 5 degrees are ruled by Mercury, next 8 degrees ruled by Jupiter, next 7 degrees ruled by Saturn and last 5 degrees ruled by Mars