ok I did some googling and wikipedia research and here is what i found out

THERE IS NO GEOGRAPHIC CENTER OF THE EARTH

Why?

simply because the Earth is spherical in shape, so its exact center would be its core and not located anywhere on the surface.

As far as geographic center is concerned it is a matter of prespective - if you are in spain to you that is the geographic center of the earth because you measure time zones and distances from that particular location..

same would apply if you are in China for you that would be the center.

Further research : I found an interesting article claiming Jeuresulem was the center of the earth

which just goes to show that every religion wants to portray its holy places as being the center of the world and even the universe....

So basically there is no geographic center of the earth