अधोलोकवर्णनम् (Adholoka-varṇana) — Description of the Lower Worlds and Cosmographic Measures
त्रयोदशार्द्धं माद्येन त्वृक्षाणां चरते रविः / मुहूर्तैस्तावदृक्षाणि नक्तं द्वादशभिश्चरन्
trayodaśārddhaṃ mādyena tvṛkṣāṇāṃ carate raviḥ / muhūrtaistāvadṛkṣāṇi naktaṃ dvādaśabhiścaran
Ravi moves among the constellations for thirteen and a half (muhūrtas); and at night, in twelve muhūrtas, he passes through that same measure of stars.