अग्निनिचयः (Agninichaya) / The Accumulation of Sacred Fire & the Classification of Pitṛs by Time-Order
संवत्सरः समेतश्च स्थानान्येतानि स्थानिनाम् / ऋतवस्तु निमेः पुत्रा विज्ञेयास्ते तथैव षट्
saṃvatsaraḥ sametaśca sthānānyetāni sthāninām / ṛtavastu nimeḥ putrā vijñeyāste tathaiva ṣaṭ
Their totality is the saṃvatsara, the year—these are the abodes of the holders of time. The ṛtus, the seasons, are known as the sons of Nimi, and they are six in number.