Sun and whole universe are round – Yajur Veda 20. 23
Shape of Earth is like an Oblate Spheroid. (Rig VedaXXX. IV.V)
Moon is enlightened by the sun – Yajur Veda 18, 20.
‘Earth is flattened at the poles’ (Markandeya Purana 54.12)
Blue Sky is Nothing but scattered sunlight (Markandeya Purana 78.8)
There are many suns – Rg Veda 9. 114. 3.
Seven colours in the sun – Atharva Veda 7. 107. 1.
Electromagnetic field, conversion of mass and energy – Rg 10. 72.
The gravitational effect of solar system makes the earth stable (R.V.1-103-2, 1-115-4 and 5-81-2).
The axle of the earth does not get rusted ,the earth continues to revolve on its axle (R.V. 1-164-29)
The Sun never sets or rises and it is the earth, which rotates (Sama-Ved 121).
The science of Time and its subtle nature is described in (R.V.1-92-12 and 1-95-8)