Matsya Purana — Soma
व्यतीपाते स्थिते सूर्ये लेखादूर्ध्वं युगान्तरम् युगान्तरोदिते चैव चन्द्रे लेखोपरि स्थिते //
vyatīpāte sthite sūrye lekhādūrdhvaṃ yugāntaram yugāntarodite caiva candre lekhopari sthite //
When, at the time of vyatīpāta, the Sun is positioned, the point called yugāntara lies above the drawn line (lekhā). And likewise, when the Moon rises at yugāntara, it is situated above the line.
This verse is not about pralaya; it gives technical, observational rules using Sun–Moon positions (vyatīpāta, yugāntara) to determine where a key point should fall relative to a marked guideline in ritual/architectural procedure.
It supports the king/householder duty of commissioning construction and rituals correctly—ensuring orientation and timing are set by recognized astronomical markers so that public works (temples, altars, consecrations) follow śāstric procedure.
It specifies a layout rule: during vyatīpāta, the ‘yugāntara’ marker is taken as lying above the guideline (lekhā), and similarly the Moon’s rising at yugāntara is read as being above the line—used for alignment/measurement in Vastu-based planning.