But! This bulgy “ellipsoid” Earth isn't the whole story either.

但椭圆地球并不是我们要探讨全部内容。

In 2006, data gathered by Nasa's Wilkinson satellite suggested that the Universe itself may be an ellipsoid — an oval.

2006 年，美国国家航空航天局威尔金森卫星收集数据表明，宇宙本身可能是一个椭圆体——椭圆形。

But Newton's claim could be tested on an ellipsoid.

但牛顿可以在一个椭球体上得到验证。

And that's tricky to do because it turns out the Earth isn't a perfect ellipsoid either.

这做起来很手，因为事实证明地球也不是一个完美椭球体。

They were also able to use this data to calculate the perimeter of this ellipsoid.

们还能够利用这些数据来计算这个椭球体周长。

It's not a sphere, not an ellipsoid.

它既非球体，也非椭球体。

Then we said, no, it's this ellipsoid.

于是我们又说，不，它是这种椭球体。

There'd be large swaths of the Earth that are just barely under the ellipsoid of some that are above it.

地球上有大片区域几乎都在椭球体之下，有些则位于其上方。

And so in 1984, the US Defense Mapping Agency settled on an approximation, an ellipsoid centered exactly at the Earth's center of mass.

因此， 1984年， 美国国防制图局确定了一个近似值，即一个精确位于地球质心中心椭球体。

Ecuador's monument to the equator is 240m off, and the circumference of the ellipsoid that best matches Earth's actual shape isn't a perfect 40,000km.

厄瓜多尔赤道纪念碑偏离了实际赤道线240米，而与地球实际形状最匹配椭球体周长并非精确40,000公里，而是40,007.863公里。

These dense lumps of rock bump out from the ellipsoid and their mass gravitationally attracts oceans, while valleys in the ocean floor have less mass and the oceans flow away, shallower.

这些稠密岩石块从椭球体中碰撞出来，它们质量在引力作用下吸引着海洋，而海床上峡谷质量较小，上方海水也因此流走。

This is the ellipsoid we used today, the one that's published by the National Geospatial Intelligence Agency And it's the foundation of the coordinate system used by GPS.

这是我们今天使用椭球体，由美国国家地理空间情报局发布， 也是GPS所用坐标系统基础。

And then with a bunch of trigonometry, they could figure out the distance from A to B. And this sort of arduous process proved that, yeah, the Earth was an ellipsoid.

然后通过大量三角运算，们能够计算出A到B距离。 这种艰苦过程证明了，是， 地球是一个椭球体。