Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
सार्पैन्द्रपौष्णभेष्वंत्यषोडशेशा भसंधयः ।तदग्निमेष्वाद्यपादा भानां गंडातसंज्ञकाः ॥ ४४९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 449.
In Ashlesha, Jyeshtha and Revati, the last sixteenth parts are the junctions of the stars. In the stars after them, the first quarters are called gandanta (the edge-point between signs).
Simple meaning: The ends of Ashlesha, Jyeshtha and Revati and the starts of Magha, Mula and Ashvini are danger junctions.
उग्रं च संधित्रितयं गंडातं त्रिविधं महत् ।
Gandanta has three kinds. Two bad planets facing the lagna make a worse fault.
सा कर्तरीति विज्ञेया दंपत्योर्गलकर्तरी ।
Bad planets on both sides of the lagna cut it. Do not use such a lagna.
अपि सौम्यग्रहैर्युक्तं गुणैः सर्वैः समन्वितम् ।
The Moon in the 6th, 8th or 12th spoils a lagna even when it looks good.