Matsya Purana — The Attendant Hosts of the Sun and Moon: Monthly Gaṇas
ह्रासवृद्धी तथैवास्य रश्मयः सूर्यवत्स्मृताः त्रिचक्रोभयतो ऽश्वश्च विज्ञेयः शशिनो रथः //
hrāsavṛddhī tathaivāsya raśmayaḥ sūryavatsmṛtāḥ tricakrobhayato 'śvaśca vijñeyaḥ śaśino rathaḥ //
Its waning and waxing are likewise to be understood as arising from its rays, in the same manner as the Sun’s. The chariot of the Moon should be known as having three wheels, with horses yoked on both sides.
This verse does not describe Pralaya directly; it presents a cosmological (astronomical) model explaining the Moon’s waxing and waning through its rays and describing the Moon’s chariot.
Indirectly, it supports dharma through right-knowledge (tattva-jñāna): understanding lunar increase/decrease underpins calendrical timekeeping (tithis, months) used for royal administration and household observances such as fasting days and ritual scheduling.
Ritually, lunar waxing/waning governs timing for vratas and sacrifices; while no Vāstu rule is stated, such lunar calendrics commonly inform auspicious dates (muhūrta) for consecrations and temple-related rites.