Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
शून्यदस्राः शून्यचंद्राः पूर्णचंद्रा गतेंद्रवः ।तर्कचंद्रा वेदपक्षाः खरामाश्चाश्विभात्क्रमात् ॥ ४६७ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 467.
Then 20, 10, 10, 18, 16, 24 and 30. These are for Uttara Ashadha to Revati. The numbers run in order from Ashvini.
Simple meaning: The last seven stars get 20, 10, 10, 18, 16, 24 and 30.
आभ्यः परास्तु घटिकाश्चतस्रो विषसंज्ञिताः ।
Four periods after those counts are called poison. Avoid them in weddings and other acts.
भास्करादिषु वारेषु ये मुहूर्ताश्च निंदिताः ।
Time slots blamed for each weekday should be avoided in weddings, even if they have many good points.
निहितावारदोषा ये सूर्यवारादिषु क्रमात् ।
Weekday faults should be avoided in every good rite, even if the day has all good qualities.