Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
सौरारज्ञेज्यशुक्रेंदुसूर्याधिक्यं परस्परम् ।पापास्तु बलिनः सौम्या विवक्षाः कण्टकोपगे ॥ ३१ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 31.
Saturn, Mars, Mercury, Jupiter, Venus, the Moon and the Sun: each is stronger than the one before. Bad planets are strong. Good planets ... in a kendra (corner house). (Our text is unclear here: one word about the good planets is damaged.)
Simple meaning: The planets go up in strength from Saturn to the Sun. Good planets count when they stand in a corner house.
क्लीबे तदूशनाद्वापि चंद्रार्कांशसमं जनुः ।
Bad planets in their own navamsha, good ones in others', and an animal-sign lagna point to a non-human birth.
निर्बलं च तदादेश्यं वियोनेर्जन्म पंडितैः ।
A weak lagna can mean a non-human birth. The verse then lists the creature's body parts.
पार्श्वे कुक्षी त्वपानांघ्री मेढ्रमुष्कौ तथा स्फिजौ ।
For a four-footed animal, the signs from Aries on stand for its body parts in this order.