Kāla-vibhāga: The Divisions of Time from Atom to Brahmā, and the Lord Beyond Time
अयने चाहनी प्राहुर्वत्सरो द्वादश स्मृत: । संवत्सरशतं नृणां परमायुर्निरूपितम् ॥ १२ ॥
ayane cāhanī prāhur vatsaro dvādaśa smṛtaḥ saṁvatsara-śataṁ nṝṇāṁ paramāyur nirūpitam
Satu siang dan malam para dewa terbentuk dari dua ayana; gabungan siang-malam itu disebut satu saṁvatsara bagi manusia. Umur tertinggi manusia ditetapkan seratus tahun.
This verse states that two ayanas constitute a day and night for the devas, twelve months form one year, and the maximum human lifespan is described as one hundred years.
In Canto 3, Chapter 11, Śukadeva explains the structure of time to show its vast, ordered nature and to help the listener cultivate detachment and urgency for spiritual realization.
Remembering life’s limited span encourages disciplined sādhana, wiser priorities, and reduced attachment to temporary achievements.