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

但牛顿的论断可以在一个椭球上得到验证。

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

他们还能够利用些数据来个椭球的周长。

It's not a sphere, not an ellipsoid.

它既非球，也非椭球。

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

做起来很棘手，因为事实证明地球也不是一个完美的椭球。

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

于是我们又说，不，它是种椭球。

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的椭球。

The material, which includes spherical, ellipsoidal, and dumbbell-shaped glass beads as well as colloidal items with a porous structure and sputtering material in fluid form, have also been found.

此外，还发现了球状、椭球状、哑铃状等形状的玻璃珠，以及气孔构造的胶结质和流形态的溅射物。

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.

厄瓜多尔的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的椭球的周长并非精确的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.

些稠密的岩石块从椭球中碰撞出来，它们的质量在引力作用下吸引着海洋，而海床上的峡谷质量较小，上方的海水也因此流走。

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.

是我们今天使用的椭球，由美国国家地理空间情报局发布， 也是GPS所用坐标系统的基础。

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.

然后通过大量的三角运，他们能够出A到B的距离。 种艰苦的过程证明了，是的， 地球是一个椭球。