πSpace
Earth Is Not a Perfect Sphere
Earth is an oblate spheroid, meaning it bulges at the equator and is flattened at the poles due to its rotation.
About this fact
The centrifugal force created by Earth's rotation causes it to bulge slightly around the equator. As a result, the Earth's equatorial diameter is about 43 kilometers (27 miles) larger than its polar diameter. This means if you stand at the equator, you are slightly farther from the Earth's center than if you stand at one of the poles. This shape also affects gravity, making it slightly weaker at the equator.