Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 7 · Samskara Muhurtas
संस्कारमुहूर्ताः
अष्टमे शुद्धिसंयुक्ते शुभलग्ने शुभांशके ।जन्माष्टमे न शीतांशौ षष्ठाष्टांत्यविवर्जिते ॥ ३३९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 339.
The 8th house should be clean. The lagna (rising sign) and navamsha (one-ninth part of a sign) should be good. The Moon should not be in the 8th from the birth sign. It should not be in the 6th, 8th or 12th.
Simple meaning: A clean 8th house, a good rising sign, and the Moon away from the 8th, 6th and 12th help this rite.
धनत्रिकोणकेंद्रस्थैः शुभैस्त्र्यायारिगैः परैः ।
Shave with good planets well placed. Not after oiling, at twilight, on Tuesday, at night, after eating or in battle.
नोत्कटे भूषिते नैव याने न नवमेऽहि च ।
Do not shave when decked out, on a journey or on the 9th day. Kings shave every 5th day.
कर्तव्यं क्षौरनक्षत्रेऽप्यथ वास्योदये शुभम् ।
Shave on a good star or lagna. It is also allowed at a king's order, a sacrifice or a death.