Brihat Samhita
वृत्तायां आषाढ्यां कृष्णचतुर्थ्यां अजैकपादऋक्षे । यदि वर्षति पर्जन्यः प्रावृट्शस्ता न चेन्न ततः ॥ २६-१४ ॥
If there should be rain on the lunar day of the dark half immediately following the Āṣādhī Yoga day when the Moon is in the asterism of Pūrvāṣāḍha, the rainy season will be a prosperous one but not otherwise.
english translation
vRttAyAM ASADhyAM kRSNacaturthyAM ajaikapAdaRkSe । yadi varSati parjanyaH prAvRTzastA na cenna tataH ॥ 26-14 ॥
hk transliteration by Sanscript