tad-dvipa-madhye manasottara-namaika evarvacina-paracina-varsayor maryadacalo ’yuta-yojanocchrayayamo yatra tu catasrsu diksu catvari purani loka-palanam indradinam yad-uparistat surya-rathasya merum paribhramatah samvatsaratmakam cakram devanam aho-ratrabhyam paribhramati.
tat-dvipa-madhye—within that island; manasottara—Manasottara; nama—named; ekah—one; eva—indeed; arvacina—on this side; paracina—and beyond, or outside; varsayoh—of tracts of land; maryada—indicating the boundary; acalah—a great mountain; ayuta—ten thousand; yojana—eight miles; ucchraya-ayamah—whose height and width; yatra—where; tu—but; catasrsu—in the four; diksu—directions; catvari—four; purani—cities; loka-palanam—of the directors of planetary systems; indra-adinam—headed by Indra; yat—of which; uparistat—on the top; surya-rathasya—of the chariot of the sun-god; merum—Meru Mountain; paribhramatah—while circumambulating; samvatsara-atmakam—consisting of one samvatsara; cakram—wheel or orbit; devanam—of the demigods; ahah-ratrabhyam—by the day and night; paribhramati—moves around.
In the middle of that island is a great mountain named Manasottara, which forms the boundary between the inner side and the outer side of the island. Its breadth and height are 10,000 yojanas [80,000 miles]. On that mountain, in the four directions, are the residential quarters of demigods such as Indra. In the chariot of the sun-god, the sun travels on the top of the mountain in an orbit called the Samvatsara, encircling Mount Meru. The sun’s path on the northern side is called Uttarayana, and its path on the southern side is called Daksinayana. One side represents a day for the demigods, and the other represents their night.
The movement of the sun is confirmed in the Brahma-samhita (5.52): yasyajnaya bhramati sambhrta-kala-cakrah. The sun orbits around Mount Sumeru, for six months on the northern side and for six months on the southern. This adds up to the duration of a day and night of the demigods in the upper planetary systems.
Link to this page: https://prabhupadabooks.com/sb/5/20/30