100K views · 2.1K reactions | Ever wonder why Earth bulges at the equator? That slight oblate spheroid shape—caused by the planet’s spin—may have made higher life possible. Without it, the surface would be so unstable that evolution as we know it might never have happened. | The Randall Carlson | Facebook

Most people think Earth is a perfect sphere… But it's actually an oblate spheroid—bulging at the equator and flattened at the poles. The equator is 13 miles farther from Earth’s center than the poles. If you wanted a perfect sphere with the same volume as Earth? It would be 7,920 miles in diameter. And here’s where it gets wild—this number ties directly into sacred geometry and ancient models of creation. The blueprint of the universe might be more mathematical than we think. | The Randall Carls

So how do we know the Earth is round (or an oblate spheroid to be precise)? @josieapeters takes a trip into our archives for #BBCIdeas. #space #ScienceHistory #earthscience | The Royal Society