Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 8 · Marriage
विवाहः
माघफाल्गुनवैशाखज्येष्ठमासाः शुभप्रदाः ।मध्यमा कार्तिको मार्गशीर्षो वै निंदिताः परे ॥ ४१६ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 416.
The months Magha, Phalguna, Vaishakha and Jyeshtha give good results. Kartika and Margashirsha are middling. The others are not advised.
Simple meaning: Magha, Phalguna, Vaishakha and Jyeshtha are good months for marriage.
न कदाचिद्दशर्क्षेषु भानोरार्द्राप्रवेशनात् ।
No marriage, god-installing or sacred thread while the Sun moves through the ten stars from Ardra.
नास्तंगते सिते जीवे न तयोर्बालवृद्धयोः ।
Avoid marriage when Venus or Jupiter is set, very young or old, or when Jupiter is in Leo.
पश्चात्प्रागुदितः शुक्रो दशत्रिदिवसं शिशुः ।
Venus is weak 10 or 3 days after rising and 5 or 15 before setting. Jupiter, 15 days each.