Vishnupurana 2.8.39

2.8.39

ato mandataraṃ nābhyāṃ cakraṃ bhramati vai yathā /
mṛtpiṇḍa iva madhyastho dhruvo bhramati vai tathā //

When the sun has travelled in the centre of Pushkara a thirtieth part of the circumference of the globe, his course is equal in time to one Muhúrtta; and whirling round like the circumference of the wheel of a potter, he distributes day and night upon the earth. In the commencement of his northern course, the sun passes to Capricornus, thence to Aquarius, thence to Pisces, going successively from one sign of the Zodiac to another. After he has passed through these, the sun attains his equinoctial movement (the vernal equinox), when he makes the day and night of equal duration. Thenceforward the length of the night decreases, and the day becomes longer, until the sun reaches the end of Gemini, when he pursues a different direction, and, entering Cancer, begins his declension to the south. As the circumference of a potter's wheel revolves most rapidly, so the sun travels rapidly on his southern journey: he flies along his path with the velocity of wind, and traverses a great distance in a short time. In twelve Muhúrttas he passes through thirteen lunar asterisms and a half during the day; and during the night he passes through the same distance, only in eighteen Muhúrttas. As the centre of the potter's wheel revolves more slowly than the circumference, so the sun in his northern path again revolves with less rapidity, and moves over a less space of the earth in a longer time, until, at the end of his northern route, the day is again eighteen Muhúrttas, and the night twelve; the sun passing through half the lunar mansions by day and by night in those periods respectively. As the lump of clay on the centre of the potter's wheel moves most slowly, so the polar-star, which is in the centre of the zodiacal wheel, revolves very tardily, and ever remains in the centre, as the clay continues in the centre of the wheel of the potter.