Antipode of any spot on Earth, in geography, is the point on Earth’s surface diametrically opposite to it; the antipode of a region similarly represents the area opposite it. A pair of points antipodal to each other are situated such that a straight line line connecting the two would pass through Earth’s center. Such points are as far away from each other as possible, a great-circle distance of 10,800 nautical miles (20,000 km)
Pomponius Mela, the first Roman geographer, asserted that the earth had two habitable zones, a North and South one, but that it would be impossible to get into contact with each other because of the unbearable heat at the equator.
From the time of St Augustine, the Christian church was skeptical of the notion. Augustine asserted that “it is too absurd to say that some men might have set sail from this side and, traversing the immense expanse of ocean, have propagated there a race of human beings descended from that one first man.