Śrīmad-Bhāgavatam 3.11.11
SB 3.11.11
Open the full passageSanskrit
tayoḥ samuccayo māsaḥ pitṟṇāṁ tad ahar-niśam dvau tāv ṛtuḥ ṣaḍ ayanaṁ dakṣiṇaṁ cottaraṁ divi
Translation
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.