Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
उभयोर्याममात्रं तु वर्जयेत्तत्प्रयत्नतः ।अश्लेषान्ते मघादौ तु घटिकानां चतुष्टयम् ॥ ३४ ॥
In the full Agni Purana this is chapter 126, verse 34.
Both together come to about one yama (three-hour part of the day). Avoid that time with care. At the end of Ashlesha and the start of Magha, avoid four ghatikas (24-minute units).
Simple meaning: Avoid about three hours at the Revati-Ashvini joint, and about 1.5 hours at Ashlesha-Magha.
द्वितीयं गण्डमाख्यातं तृतीयं भैरवि शृणु ।
The third edge, between Jyeshtha and Moola, is a fierce stretch of time.
न कुर्याच्छुभकर्माणि यदीच्छेदात्मजीवितम् ।
Avoid good works at these times. A child born then can bring death to the parents.
विष्कम्भे घटिकास्तिस्रः शूले पञ्च विवर्जयेत् ।
In some bad almanac combinations, avoid a set stretch of time, from about one to four hours.