Srimad Bhagavatam Canto 05, Chapter 21, Text 13

SB 5.21.13

yasyaikam cakram dvadasaram san-nemi tri-nabhi samvatsaratmakam samamananti tasyakso meror murdhani krto manasottare krtetara-bhago yatra protam ravi-ratha-cakram taila-yantra-cakravad bhraman manasottara-girau paribhramati.
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The chariot of the sun-god has only one wheel, which is known as Samvatsara. The twelve months are calculated to be its twelve spokes, the six seasons are the sections of its rim, and the three catur-masya periods are its three-sectioned hub. One side of the axle carrying the wheel rests upon the summit of Mount Sumeru, and the other rests upon Manasottara Mountain. Affixed to the outer end of the axle, the wheel continuously rotates on Manasottara Mountain like the wheel of an oil-pressing machine.
Srimad Bhagavatam Canto 05, Chapter 21, Text 12
Srimad Bhagavatam Canto 05, Chapter 21, Text 14