The Sun does never set nor rise. When people think the Sun is setting (it is not so). For after having arrived at the end of the day it makes itself produce two opposite effects, making night to what is below and day to what is on the other side…Having reached the end of the night, it makes itself produce two opposite effects, making day to what is below and night to what is on the other side. In fact, the Sun never sets….”
Earth as Flat at Poles:
"Twenty-four centuries before Isaac Newton, the Hindu Rig-Veda asserted that gravitation held the universe together. The Sanskrit speaking Aryans subscribed to the idea of a spherical earth in an era when the Greeks believed in a flat one. The Indians of the fifth century A.D. calculated the age of the earth as 4.3 billion years; scientists in 19th century England were convinced it was 100 million years."
(source: Lost Discoveries: The Ancient Roots of Modern Science - By Dick Teresi p. 7 - 8).
It is quite remarkable that the Markandeya Purana (54.12) speaks of Earth as being flattened at the poles and bulging at the equator, that is, not perfectly spherical.
The Vishnu Purana, in an obvious elaboration of the above quotation from the Aitareya Brahmana, also speaks of antipodes of Earth and indeed implies the existence of Earth’s rotation. In addition, even more elementary concepts like the phases of Moon and the cause of twilight were well understood, as was the fact that the blue sky is nothing but scattered sunlight. (cf. Markandeya Purana, 78.8, or 103.9)