Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 11 · Rain, Kurma Chakra, Utpata
वृष्टिः कूर्मचक्रम् उत्पाताश्च
पूर्वाषाढां गतो भानुर्जीमूतैः परिवेष्टितः ।वर्षत्यार्द्रादिमूलांतं प्रत्यक्षं प्रत्यहं तथा ॥ ७३० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 730.
The Sun may be in Purva Ashadha, wrapped in clouds. Then it rains plainly, every day, from Ardra to Moola.
Simple meaning: 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.
भरणी सर्वसस्या च सर्वनाशाय चाश्विनी ।
Bharani is good for all crops. Ashvini can harm them. Venus 7th from Jupiter, in the west, comes next.