Strange but True: Earth Is Not Round
By Charles Q. Choi on April 12, 2007 Scientific American
It may seem round when viewed from space, but our planet is actually a bumpy spheroid.
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Isaac Newton 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. He was correct and, because of this bulge, the distance from Earth's center to sea level is roughly 21 kilometers (13 miles) greater at the equator than at the poles.
LINK
By Charles Q. Choi on April 12, 2007 Scientific American
It may seem round when viewed from space, but our planet is actually a bumpy spheroid.
...
Isaac Newton 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. He was correct and, because of this bulge, the distance from Earth's center to sea level is roughly 21 kilometers (13 miles) greater at the equator than at the poles.
LINK