Brihat Samhita
वृत्तायां आषाढ्यां कृष्णचतुर्थ्यां अजैकपादऋक्षे । यदि वर्षति पर्जन्यः प्रावृत्शस्ता न चेन्न तदा ॥ २७-०९ ॥
If, when the constellation Āṣāḍhā has begun, on the fourth day of the dark fortnight, under the asterism Ajā-ekapāda, the rain-god sends down rain, then the rainy season is deemed auspicious; if not, then it is not.
english translation
vRttAyAM ASADhyAM kRSNacaturthyAM ajaikapAdaRkSe । yadi varSati parjanyaH prAvRtzastA na cenna tadA ॥ 27-09 ॥
hk transliteration by Sanscript