vavṛdhāte 'rka-vahnivat

samhatya-by combination of; anyonyam-one another; ubhayoh-of both; tejasi-the glares; sara-weapons; samvrte-covering; avrtya-covering; rodasi-the complete firmament; kham ca-outer space also; vavrdhate-increasing; arka-the sun globe; vahnivat-like fire.