सिद्धान्तशिरोमणि: गणिताध्याय (भास्कराचार्य - ग्रहगणित, मध्यमाधिकार व स्पष्टाधिकार सटीक)

Why none of the latter Hindu astronomers, though
many of them could intuit this simple phenomenon, boldly
came out asserting this, is rather mysterious. Even today
there is such an irrational orthodox type of scholars who
are not in touch with modern astronomy, holding the view
that the earth does not move.
In Hindu Astronomy it was postulated that there is
what is called the pravaha wind, which effects moving of
the entire stellar universe along with the planets from
east to West. It is a very simple matter to visualize
earths' rotation, instead of supposing that the entire stellar
Universe is being driven round the earth. The absurdity
in this latter supposition might not have been clear to the
orthodox type of the Hindu Astronomers, for, they could
not measure the dimensions of the giant stars and super-
giants, which are everyone of them mighty Suns. Though,
however, the dimensions of the Sun were known to them
to be far greater than those of the earth, it did not occur to
them why a mighty Sun should go round a pigmy earth.
Or even if it occured to astronomers like Bhaskara, they
dared not to go against the puranic tradition.
Since the stars do not move among themselves while
partaking this diurnal motion, the entire starry skies are
obliged to go round the earth as a rigid structure, if we
suppose that the earth is not rotating about, herself. This
kind of supposition is just like a revolving person, revol-
ving about himself and claiming that the entire Universe is
revolving round him and not he about himself.
Bhaskara gives the proof of getting this number of
diurnal rotations of the stars during an year in the verses
5-7 of Madhyagati Vāsanā, समं भसूर्यावुदितौ etc. as follows.
Suppose a star and the Sun rise together today. Tomorrow
the star will have arisen earlier than the Sun who will
have moved towards the east of the star by his own
(apparent) daily motion. So tomorrow's sun-rise will get