Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 7 · Samskara Muhurtas
संस्कारमुहूर्ताः
स्फूर्जिते केंद्रगे भानौ व्रतिनां पितृनाशनम् ।पंचदोषोनितं लग्नं शुभदं चोपनायने ॥ ३७७ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 377.
Say the Sun is sphurjita (fierce) in a kendra (corner house). There may be a risk to the life of the boy's father. A lagna (rising sign) free of the five faults gives good results in the upanayana (sacred thread rite).
Simple meaning: A fierce Sun in a corner house can harm the father. A fault-free rising sign is good.
विना वसंतऋतुना कृष्णपक्षे गलग्रहे ।
Do the rite in spring. Avoid the dark half, bad days, study holidays, bad half-days and the 6th.
त्रयोदश्यादिचत्वारि सप्तम्यादिदिनत्रयम् ।
The 13th to the 1st, the 7th to 9th, and the 4th are the eight bad days.
क्षुरिकाबंधनं वक्ष्ये नृपाणां प्राक्करग्रहात् ।
Kings tie on the dagger before marriage, in marriage months and the bright half.