Matsya Purana — Characteristics of Dvāpara and Kali Yugas
क्रमेण परिवृत्तास्ता मनोरन्तरमुच्यते युगाख्यासु तु सर्वासु भवतीह यदा च यत् //
krameṇa parivṛttāstā manorantaramucyate yugākhyāsu tu sarvāsu bhavatīha yadā ca yat //
As they revolve successively in due order, this is called the interval of a Manu (a Manvantara). And within all the named Yugas, whatever occurs here does so at the proper time and in its proper measure.
It emphasizes cyclical cosmic order: ages (Yugas) and Manu-periods (Manvantaras) recur in sequence, implying that dissolution and renewal occur according to fixed time-law rather than randomness.
By framing events as time-bound (yadā…yat), it supports the Matsya Purana’s ethic that dharma must be practiced appropriate to one’s era and circumstance—kings and householders should act in harmony with the yuga’s conditions while upholding enduring principles.
No direct Vastu rule is stated, but the principle of ‘proper time and proper measure’ underlies ritual timing (muhūrta, kalā) and proportional canons used in Puranic temple architecture: actions succeed when performed in the right temporal and quantitative order.