If the Quran isn't from Allah, how did it know the Earth was round 800 years after Eratosthenes found its size?

Eratosthenes will always be remembered for the calculation of the Earth's circumference circa 240 BC, using trigonometry and knowledge of the angle of elevation of the Sun at noon in Alexandria and Syene (now Aswan, Egypt). The calculation is based on the assumption that the Earth is spherical and that the Sun... show more Eratosthenes will always be remembered for the calculation of the Earth's circumference circa 240 BC, using trigonometry and knowledge of the angle of elevation of the Sun at noon in Alexandria and Syene (now Aswan, Egypt). The calculation is based on the assumption that the Earth is spherical and that the Sun is so far away that its rays can be taken as parallel.

http://www.juliantrubin.com/bigten/erato...

The quran states that the Earth is egg-shaped, and it also states the Earth is flat and does not move.

http://skepticsannotatedbible.com/quran/...

What are the odds Mohammed knew all of that, if it wasn't revealed by Allah?
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