Ka’bah is the center of earth:

The Sacred House or Ka’bah is in the center of a circle that goes through the continents of both the ancient and modern worlds. 

Land on the Earth’s surface spreads regularly round Allah’s Sacred House in Mecca. Such fact has been confirmed by the most up-to-date studies carried out by the astronomical research center in an Arab country. The study was carried out by using the computer for measuring distances between Mecca and a number of cities of both modern and ancient worlds.

Computer calculations showed that the furthest points in Africa, Asia, and Europe are all located at a distance of 8,000 km’s from Mecca. It is well known that Europe, Africa and Asia constituted the ancient world. Cities on the edges of these continents are all 8,000 km’s away from Mecca.
 

Dear brothers, as for the edges of the new world, namely North and South Americas and Australia, they are all 13,000 km far from Mecca. This means that Mecca is also the center of the modern world, as cities on the edges of the modern world are 13,000 km far from Mecca, and cities on the edges of the ancient world are 8,000 km far from it.

Therefore, the above-mentioned study shows clearly that Mecca is the center of both ancient and modern worlds. In this context, Allah, All-Mighty, says, 

“Verily, the first House (of worship) appointed for (all) mankind was at Mecca, full of blessings and a guidance for all worlds (of mankind and jinn).”

[Aal-‘Imran: 96-97]