Brihat Samhita
दैवविदविहितचित्तो द्युनिशं यो गर्भलक्षणे भवति । तस्य मुनेरिव वाणी न भवति मिथ्याम्बुनिर्देशे ॥ २१-०३ ॥
The predictions of an astronomer who pays exclusive attention, both day and night to the indications of rain afforded by pregnant clouds (garbhalakṣaṇa), will as little fail of success as the words of Ṛṣis.
english translation
daivavidavihitacitto dyunizaM yo garbhalakSaNe bhavati । tasya muneriva vANI na bhavati mithyAmbunirdeze ॥ 21-03 ॥
hk transliteration by Sanscript