Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
ताराबलेन शीतांशुर्बलवांस्तद्वशाद्रविः ।बली संक्रममाणस्तु तद्वत्खेटा बलाधिकाः ॥ २७० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 270.
The Moon is strong through tara (star count from the birth nakshatra) strength. Through the Moon, the Sun is strong as it enters a sign. In the same way, the other planets gain strength.
Simple meaning: 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.
त्र्यायारिषु कुजः श्रेष्ठो जन्मना चेन्न विध्यते ।
Mars is good in the 3rd, 11th and 6th, unless planets in the 12th, 5th or 9th block it.