Now, as per parashara Lord Vishnu took nine forms to represent nine planets.

Sun - Rama
Moon - Krishna
Mars - Narasimha
Mercury - Balarama
Jupiter - Vaamna
Venus - Parsuram
Saturn - Koorma
Rahu - Varaha
Ketu - Matsya


9 = There are nine planets
9 = 27 Nakshatras (2+7=9)
9 = The Japa mala contains 108 beads (1+0+8=9).
9 = Ashtottaram (Ashtottaram means 108 i.e.1+0+8=9
9 = Sahasranaamaarchana (1+0+0+8=1008)
9 = Durga navrathri
9 = Lord Rama born in Navami
9 = Lord Vishnu took nine avatars (incarnations)except Kalki avatar
9 = Nine gems
9 = Ninth house in our horoscope represents Fortune (Bhagya sthana)
9 = Mother carries her baby for 9 months in her womb.
Now we obvously know 9 forms of Lord Narasimha.

If you sit down and think, in ancient scriptures, lot of things are 9 or when their all digits are total calculated.... it rounds up to 9

There is a reason why 9, 9th house and navamsa is so important... This is reason why 9th house is also house of Dharma.