Thursday, 22 May 2014

More spherical lore...

It was Isaac Newton who first proposed that Earth was not perfectly round. Instead, he suggested it was an oblate spheroid—a sphere that is squashed at its poles and swollen at the equator and, because of this bulge, the distance from Earth's centre to sea level is roughly 21 kilometres (13 miles) greater at the equator than at the poles.

Just as fascinating and probably a tad more entertaining is this optical illusion: 
click on the link