त्रेता त्रीणि सहस्राणि युगसंख्याविदो विदुः तस्यापि त्रिशती संध्या संध्यांशः संध्यया समः //
tretā trīṇi sahasrāṇi yugasaṃkhyāvido viduḥ tasyāpi triśatī saṃdhyā saṃdhyāṃśaḥ saṃdhyayā samaḥ //
Quienes conocen el cómputo de los yuga afirman que el Tretā‑yuga consta de tres mil (años divinos). Su período crepuscular (sandhyā) es de trescientos, y su porción crepuscular subsiguiente (sandhyāṃśa) es igual a la sandhyā.
It gives the technical chronology of cosmic time (yuga length plus junctions), which is used in Purāṇas to situate recurring creation and dissolution cycles within a measurable framework.
By defining yuga-phases and their transitions, it supports the Purāṇic idea that dharma-practice and governance must adapt to the spiritual conditions of each age, especially during transitional “sandhyā” periods.
No direct Vāstu or temple rule is stated; the key ritual takeaway is the emphasis on “sandhyā” as a sacred junction concept—transitional times are treated as especially significant for discipline, vows, and rites in Purāṇic tradition.