Matsya Purana — Characteristics of Dvāpara and Kali Yugas
एवं वर्षशतं दिव्यं संध्यांशस्तस्य वर्तते ततो वर्षशतस्यान्ते अल्पशिष्टाः स्त्रियः सुताः //
evaṃ varṣaśataṃ divyaṃ saṃdhyāṃśastasya vartate tato varṣaśatasyānte alpaśiṣṭāḥ striyaḥ sutāḥ //
Thus, for a hundred divine years, its twilight-phase (the residual interval) continues; and when that hundred years comes to an end, only a small remnant remains—women and children.
It indicates a transitional ‘twilight’ period lasting a hundred divine years during dissolution, after which humanity is reduced to a very small remnant—specifically women and children—highlighting the severity of the end-phase.
By stressing the fragility of worldly continuity during cosmic transitions, it implicitly supports the Purāṇic ethic of preparedness, protection of dependents, and dharmic stewardship—especially safeguarding the vulnerable when calamity or decline arises.
No direct Vāstu or iconographic rule is stated; the key ritual-cosmological idea is the ‘saṃdhyā-aṃśa’ (twilight interval), a transitional time often treated as spiritually sensitive in Purāṇic and Smārta practice.