Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 11 · Rain, Kurma Chakra, Utpata
वृष्टिः कूर्मचक्रम् उत्पाताश्च
आर्द्रोदयेग्रभिन्ना चेद्भवेदिति न संशयः ।चन्द्रेज्ये ज्ञेथ वा शुक्रे केंद्रेन्बीतिर्विनश्यति ॥ ७२९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 729.
At the rising of Ardra, if it is broken at the front, it will happen; there is no doubt. The Moon, Jupiter, Mercury or Venus may be in a kendra (corner house). Then the plague on crops ends. (Our text is unclear here: what is broken at Ardra's rising.)
Simple meaning: 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.
वृष्टिश्चेत्पौष्णभें तस्माद्दशर्क्षेषु न वर्षति ।
Rain in Revati means no rain for the next ten stars.
कन्योदये प्रभिन्ने चेत्सर्वदा वृष्टिरुत्तमा ।
Virgo split at the rising brings the best rain. Uttara Bhadrapada gives an early crop and Revati a late one.