|Canto 5: The Creative Impetus||Chapter 22: The Orbits of the Planets|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 5.22.5
atha sa eṣa ātmā lokānāḿ dyāv-āpṛthivyor antareṇa nabho-valayasya kālacakra-gato dvādaśa māsān bhuńkte rāśi-saḿjñān saḿvatsarāvayavān māsaḥ pakṣa-dvayaḿ divā naktaḿ ceti sapādarkṣa-dvayam upadiśanti yāvatā ṣaṣṭham aḿśaḿ bhuñjīta sa vai ṛtur ity upadiśyate saḿvatsarāvayavaḥ
atha — therefore; saḥ — He; eṣaḥ — this; ātmā — the living force; lokānām — of all the three worlds; dyāv-ā-pṛthivyoḥ antareṇa — between the upper and lower portions of the universe; nabhaḥ-valayasya — of outer space; kāla-cakra-gataḥ — positioned in the wheel of time; dvādaśa māsān — twelve months; bhuńkte — passes; rāśi-saḿjñān — named after the zodiac signs; saḿvatsara-avayavān — the parts of the whole year; māsaḥ — one month; pakṣa-dvayam — two fortnights; divā — a day; naktam ca — and a night; iti — thus; sapāda-ṛkṣa-dvayam — by stellar calculations, two and a quarter constellations; upadiśanti — they instruct; yāvatā — by as much time; ṣaṣṭham aḿśam — one sixth of his orbit; bhuñjīta — pass; saḥ — that portion; vai — indeed; ṛtuḥ — a season; iti — thus; upadiśyate — is instructed; saḿvatsara-avayavaḥ — a part of a year.
The sun-god, who is Nārāyaṇa, or Viṣṇu, the soul of all the worlds, is situated in outer space between the upper and lower portions of the universe. Passing through twelve months on the wheel of time, the sun comes in touch with twelve different signs of the zodiac and assumes twelve different names according to those signs. The aggregate of those twelve months is called a saḿvatsara, or an entire year. According to lunar calculations, two fortnights — one of the waxing moon and the other of the waning — form one month. That same period is one day and night for the planet Pitṛloka. According to stellar calculations, a month equals two and one quarter constellations. When the sun travels for two months, a season passes, and therefore the seasonal changes are considered parts of the body of the year.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness