Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 1 · Muhurta: Marriage, Home, Farming
ज्योतिःशास्त्रम्
वारे ज्ञगुरुशुक्राणां सूर्याचन्द्रमसोस्तथा ।माघादिमासषट्के तु क्षौरमाद्यं प्रशस्यते ॥ २४ ॥
In the full Agni Purana this is chapter 121, verse 24.
The first haircut is praised on the days of Mercury, Jupiter, Venus, the Sun and the Moon. Do it in the six months from Magha.
Simple meaning: The first haircut is good on these days, in the six months from Magha.
कर्णवेधो बुधे जीवे पुष्ये श्रवणचित्रयोः ।
Ear-piercing and the start of study have their times. Avoid the 6th and 1st moon days.
रिक्तां पञ्चदशीं भौमं प्रार्च्य वाणीं हरिं श्रियम् ।
Worship first, and tie the girdle in the six months from Magha.
चूडाकरणमाद्यं च श्रावणादौ न शस्यते ।
The first haircut is not good from Shravana on, or when Jupiter or Venus is set.