Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 11 · Rain, Kurma Chakra, Utpata
वृष्टिः कूर्मचक्रम् उत्पाताश्च
सद्यो वृष्टिकरः शुक्रो यदा बुधसमीपगः ।तयोर्मध्यगते भानौ भवेद्वृष्टिविनाशनम् ॥ ७२४ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 724.
When Venus comes near Mercury, it quickly brings rain. If the Sun stands between the two, the rain may stop.
Simple meaning: Venus close to Mercury brings quick rain. The Sun between them can stop the rain.
मघादिपंचधिष्ण्यस्थः पूर्वे स्वातित्रये परे ।
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.