Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
नंदाभद्राजयारिक्ता पूर्णाः स्युस्तिथयः पुनः ।त्रिरावृत्त्या क्रमाज्ज्ञेया नेष्टमध्येष्टदाः सिते ॥ १३६ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 136.
The tithis (moon days) are Nanda, Bhadra (tithis 2, 7 and 12), Jaya, rikta (empty tithi) and Purna. Know them in order, going round three times. In the bright fortnight they give bad, middling and good results.
Simple meaning: Five kinds of moon day go round three times. In the bright fortnight the three rounds are poor, middling, then good.
कृष्णपक्षे त्विष्टमध्यानिष्टदाः क्रमशस्तदा ।
In the dark fortnight the three rounds are good, middling, then bad. The 8th, 12th, 6th, 4th and 14th moon days follow.
तिथयः पक्षरंध्राख्या ह्यतिरूक्षा प्रकीर्तिताः ।
The 8th, 12th, 6th, 4th and 14th moon days are harsh. A set number of time units is given for each.
त्याज्याः स्युस्तासु तिथिषु क्रमात्पंच च सर्वदा ।
Leave those time units in those moon days. Odd moon days, except the new moon and 9th, are good.