Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
न ददाति शुभं किंचिद्गोचरे वेधसंयुते ।तस्माद्वेधं विचार्याथ कथनीयं शुभाशुभम् ॥ २७७ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 277.
A planet in transit that is blocked gives nothing good. So think about the blocking first, then tell what is good and bad.
Simple meaning: A blocked planet in transit gives nothing good, so check the blocking first.
वामभेदविधानेन दुष्टोऽपि स्याच्छुभङ्करः ।
Reverse blocking can turn a bad planet good. Looks of good or bad planets reverse the result.
निष्फलौ तौ ग्रहौ स्वेन शत्रुणा च विलोकितौ ।
A planet seen by its enemy, or in its low or enemy sign, gives no result.
शुभाशुभफलं नैव दद्यादस्तमितोपि वा ।
A set planet gives no result. When planets sit badly, do a peace ritual.