Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 7 · Samskara Muhurtas
संस्कारमुहूर्ताः
शरद्ग्रीष्मवसंतेषु व्युत्क्रमात्तु द्विजन्मनाम् ।मुख्यं साधारणं तेषां तपोमासादिपंचसु ॥ ३५२ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 352.
In autumn, summer and spring, taken in reverse order, for the twice-born, the rite is first-rate. For all of them it is ordinary in the five months starting from Tapas.
Simple meaning: Autumn, summer and spring, in reverse order for the three twice-born groups, are best. Five months from Magha are ordinary.
स्वकुलाचारधर्मज्ञो माघमासे तु फाल्गुने ।
A thread rite in Magha brings family knowledge, in Phalguna knowledge of rules, in Chaitra wealth and learning.
वैशाषे धनवान्वेदशास्त्रविद्याविशारदः ।
A thread rite in Vaishakha brings wealth and learning. In Jyeshtha it brings strength and skill in rites.
शुक्लपक्षे द्वितीया च तृतीया पंचमी तथा ।
For the thread ceremony, choose the 2nd, 3rd, 5th, 7th, 10th or 13th day of the bright half.