The earth is round

The Prophet Isiah said this.

Isaiah 40:22

 He sits enthroned above the circle of the earth,
    and its people are like grasshoppers.
He stretches out the heavens like a canopy,
    and spreads them out like a tent to live in.

 

This is a accurate description for an eight-century before Christ prophet. And Solomon had given the same truth in the tenth-century before Christ.

 

Proverbs 8:27

 I was there when he set the heavens in place,
    when he marked out the horizon on the face of the deep,