Brihat Samhita
यदा तु विद्युतः श्रेष्ठाः शुभाशाः प्रत्युपस्थिताः । तदापि सर्वसस्यानां वृद्धिं ब्रूयाद्विचक्षणः ॥ २२-०५ ॥
If on the Dhāraṇa days the sky should be marked by beautiful lightning alternately appearing in opposite benefic quarters, every species of crop will thrive.
english translation
yadA tu vidyutaH zreSThAH zubhAzAH pratyupasthitAH । tadApi sarvasasyAnAM vRddhiM brUyAdvicakSaNaH ॥ 22-05 ॥
hk transliteration by Sanscript