|Canto 3: The Status Quo||Chapter 11: Calculation of Time, from the Atom|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 3.11.11
tayoḥ samuccayo māsaḥ
pitṝṇāḿ tad ahar-niśam
dvau tāv ṛtuḥ ṣaḍ ayanaḿ
dakṣiṇaḿ cottaraḿ divi
tayoḥ — of them; samuccayaḥ — aggregate; māsaḥ — month; pitṝṇām — of the Pitā planets; tat — that (month); ahaḥ-niśam — day and night; dvau — two; tau — months; ṛtuḥ — a season; ṣaṭ — six; ayanam — the movement of the sun in six months; dakṣiṇam — southern; ca — also; uttaram — northern; divi — in the heavens.
The aggregate of two fortnights is one month, and that period is one complete day and night for the Pitā planets. Two of such months comprise one season, and six months comprise one complete movement of the sun from south to north.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness