Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · Signs, Planets, Birth
जातकम् १
निशींदुकुजसौराश्च सर्वदा क्षोह्नि चापरे ।क्रूराः कृष्णे सिते सौम्याः मतं कालबलं बुधैः ॥ ३० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 55, verse 30.
The Moon, Mars and Saturn are strong at night. The others are strong by day. Mercury is always strong. Bad planets are strong in the dark fortnight and good planets in the bright fortnight. The wise call this strength of time.
Simple meaning: Moon, Mars and Saturn are strong at night. The rest are strong by day. Bad planets gain in the dark half.
सौरारज्ञेज्यशुक्रेंदुसूर्याधिक्यं परस्परम् ।
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.