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
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