Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 11 · Rain, Kurma Chakra, Utpata
वृष्टिः कूर्मचक्रम् उत्पाताश्च
मघादिपंचधिष्ण्यस्थः पूर्वे स्वातित्रये परे ।प्रवर्षणं भृगुः कुर्याद्विपरीते न वर्षणम् ॥ ७२५ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 725.
Venus may stand in the five stars from Magha, in the east. Or it may stand in the three stars from Svati, in the west. Then it brings heavy rain. If it is the other way round, there is no rain.
Simple meaning: Venus in these stars brings heavy rain. The other way round, it brings none.
पुरतः पृष्ठतो भानोर्ग्रहा यदि समीपगाः ।
Planets close to the Sun, in front or behind, bring rain. Backward ones do not.
वामभागास्थितः शुक्रो वृष्टिकृच्चेत्तु याम्यगः ।
Venus on the left side, in the south, brings rain. So do its rising, setting and the Sun entering Ardra.
संध्ययोः सस्यवृद्धिः स्यात्सर्वसंपन्नृणान्निशि ।
Rain at twilight helps crops and at night brings wealth. Little rain makes grain costly.