अधोलोकवर्णनम् (Adholoka-varṇana) — Description of the Lower Worlds and Cosmographic Measures
ऋतुत्रितयमयने द्वे हि वर्षं तु सौरकम् / निमेषा विद्युतश्चैव काष्टास्ता दश पञ्च च
ṛtutritayamayane dve hi varṣaṃ tu saurakam / nimeṣā vidyutaścaiva kāṣṭāstā daśa pañca ca
Three ṛtus (seasons) make an ayana, and two ayanas make the solar year. Also, nimeṣas, vidyuts, and kāṣṭhās are set in the reckoning as ten and five.