Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 11 · Rain, Kurma Chakra, Utpata
वृष्टिः कूर्मचक्रम् उत्पाताश्च
वामभागास्थितः शुक्रो वृष्टिकृच्चेत्तु याम्यगः ।उदयास्तेषु वृष्टिः स्याद्भानोरार्द्राप्रवेशने ॥ ७२७ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 727.
Venus on the left side brings rain, if it is in the south. There is rain at its rising and setting. There is rain when the Sun enters Ardra.
Simple meaning: 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.
आर्द्रोदयेग्रभिन्ना चेद्भवेदिति न संशयः ।
The Moon, Jupiter, Mercury or Venus in a corner house ends the plague on crops.
पूर्वाषाढां गतो भानुर्जीमूतैः परिवेष्टितः ।
The Sun in Purva Ashadha, wrapped in clouds, brings daily rain from Ardra to Moola.