How Navamsa chart is constructed?

Each Rasi of 30⁰ is divided into 9 equal parts. So each part will be 3⁰ 20’. For Fiery Rasis (Mesha, Simha, Dhanus) Navamsa starts from Mesha. For earthy signs (Vrishabha, Kanya, Makara) Navamsa starts from Makara. For Airy signs (Mithuna, Thula, Kumbha) the beginning is from Thula and for the watery signs (Karka, Vrischika and Meena) the order starts from Karka. An Example will clarify this point:

Suppose a planet say Mercury is in 15⁰ 25’ at Kanya. Kanya is earthy sign. Hence starting point for Navamsa will be Makara. 15⁰ 25’ is in the 5^th part of the rasi by dividing it with 9. Hence counting 5 from Makara we come to Vrishabha. In the Navamsa chart Mercury will be placed in Vrishabha.

Suppose Mars is in Karka 24⁰ 10’ then it falls in the 8^th part of the rasi. Karka being a watery sign counting is to begin from Karka itself. 8^th from Karka is Kumbha where Mars will be placed in Navamsa chart.

This is the way Navamsa chart is to be constructed.