Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 11 · Rain, Kurma Chakra, Utpata
वृष्टिः कूर्मचक्रम् उत्पाताश्च
वृष्टिश्चेत्पौष्णभें तस्माद्दशर्क्षेषु न वर्षति ।सिंहे भिन्ने कुजो वृष्टिरभिन्ने कर्कटे तथा ॥ ७३१ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 731.
If it rains in Revati, it does not rain in the ten stars after it. When Leo is split, Mars gives rain. So too when Cancer is not split. (Our text is unclear here: what 'split' means, and Mars's place in the line.)
Simple meaning: 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.
तदातिवर्षणं भूरि प्रावृट्काले बलोज्झिते ।
Venus in the 7th from Jupiter brings very heavy rain. A halo around the Moon is the next sign.