Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
संक्रांतिग्रहगर्क्षंवा जन्मन्युभयपार्श्वयोः ।व्रतोद्वाहादिकेष्वेव द्वयं नेष्टं तु तत्क्रमात् ॥ २६८ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 268.
Take the star of a sankranti (the Sun's entry into a sign) or of an eclipse. It may sit on either side of the birth star. For vows, marriage and the like, both are unwanted, one after the other.
Simple meaning: The star of a sankranti or an eclipse next to the birth star is not wanted for vows and marriage.
ताराबलेन शीतांशुर्बलवांस्तद्वशाद्रविः ।
Star count strength makes the Moon strong. Through the Moon, the Sun and others become strong.
शुभोऽर्को जन्मतस्त्र्यायदशषट्सु मुनीश्वर ।
The Sun is good in the 3rd, 11th, 10th and 6th from the Moon, unless blocked.
शुभो जन्मर्क्षतश्चंद्रो द्यूनांगायारिस्वत्रिषु ।
The Moon is good in several places from the birth sign, unless other planets block it.