Brihat Samhita
रविचन्द्रपरीवेषाः स्निग्धा नात्यन्तदूषिताः । वृष्टिस्तदापि विज्ञेया सर्वसस्य अर्थसाधिका ॥ २२-०७ ॥
When the halos around the Sun and the Moon are smooth and not excessively blemished, the rainfall that follows should be understood as beneficial, bringing prosperity and success to all crops.
english translation
ravicandraparIveSAH snigdhA nAtyantadUSitAH । vRSTistadApi vijJeyA sarvasasya arthasAdhikA ॥ 22-07 ॥
hk transliteration by Sanscript