“The description of the earth in the shape of a round and bald head, which was soft at first, became hard only from being breathed upon by the god Vayu, the lord of the air, forcibly suggests the idea that the authors of the sacred Vedic books knew the earth to be round or spherical; moreover, that it had been a gelatinous mass at first, which gradually cooled off under the influence of the air and time.
So much for their knowledge about our globe’s sphericity; and now we will present the testimony upon which we base our assertion, that the Hindus were perfectly acquainted with the Heliocentric system, at least 2000 years B.C.
In the same treatise the Hotar, (priest), is taught how the Shastras should be repeated, and how the phenomena of sunrise and sunset are to be explained. It says:
“The Agnishtoma is that one (that god) who burns. The sun never sets nor rises. When people think the sun is setting, it is not so; they are mistaken. For after having arrived at the end of the day, it produces two opposite effects, making night to what is below, and day to what is on the other side.
When they (the people) believe it rises in the morning, the sun only does thus: 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; nor does it set for him who has such a knowledge….” (Aitareya Brahmanam, book iii., c. v., 44. (p.10)
This sentence is so conclusive, that even the translator of the Rig-Veda, Dr. Haug, was forced to remark it. He says this passage contains “the denial of the existence of sunrise and sunset”, and that the author supposes the sun “to remain always in its high position.””
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 