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
Ang isang araw at gabi ng mga deva ay binubuo ng dalawang ayana; ang pagsasama ng araw-gabi na iyon ang itinuturing na isang saṁvatsara para sa tao. Ang pinakamataas na haba ng buhay ng tao ay itinakdang isang daang taon.
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.