Matsya Purana — The Attendant Hosts of the Sun and Moon: Monthly Gaṇas
ग्रीष्मे हिमे च वर्षासु मुञ्चमाना यथाक्रमम् धर्मं हिमं च वर्षं च यथाक्रममहर्निशम् //
grīṣme hime ca varṣāsu muñcamānā yathākramam dharmaṃ himaṃ ca varṣaṃ ca yathākramamaharniśam //
In summer, in winter, and in the rainy season—one should, in due order, adopt and relax the appropriate regimen, following the proper seasonal rule day and night, in sequence through heat, cold, and rain.
This verse is not about Pralaya; it teaches regulated conduct according to the seasons, emphasizing order and continuity in dharma through changing conditions.
It supports the idea that governance and household life should follow disciplined, season-appropriate routines—adjusting practices in summer, winter, and monsoon to preserve health, stability, and dharmic order.
No direct Vastu or iconography rule is stated; the ritual takeaway is the principle of timing—performing or moderating observances in seasonally appropriate sequence.