What is Navamsha ?
Nava means 9 and amsha means Parts in Sanskrit.
It means each sign/ Rashi /house is of 30 degrees. When we divide a sign in 9 parts its called NAV(9)AMSHA(parts).
So 30/9 = 3 degree and 20 mins (No its not maths decimals – its degrees so it comes down to 3 degree and 20 min)
Each part of the rashi (30 degree) is of 3 degree 20 minutes on 9 divisions. Each of the 9 divisions may be called as Pada.
1 Rashi = 9 x (3 degree 20 min ) = 30 degree
A rashi divided into 9 parts is called Navamsha.