Matsya Purana — Solar–Lunar Motions
ज्योतिषां चक्रमादाय सततं परिगच्छति मध्यगश्चामरावत्यां यदा भवति भास्करः //
jyotiṣāṃ cakramādāya satataṃ parigacchati madhyagaścāmarāvatyāṃ yadā bhavati bhāskaraḥ //
Taking up the wheel (cycle) of the luminaries, the Sun continually moves on; and when the Sun comes to the middle (the culminating position), he is at Amarāvatī.
This verse is not about pralaya; it describes the Sun’s continual circuit within the cosmic order, emphasizing regularity (satataṃ) rather than dissolution.
Indirectly, it supports the Purāṇic idea that dharma and ritual timing follow cosmic order: the Sun’s steady course underlies calendrical reckoning used for vows, rites, and royal/public observances.
Ritually, the Sun’s positions guide auspicious timing and directional orientation; such solar references are often used when aligning temples/altars and scheduling solar rites (sūrya-upāsanā), even though no explicit Vāstu rule is stated in this verse.