你可以在南北方向去世界各地旅行…但是你也可以旅行的东西。绕赤道一半不会看到南北变化,但仍有大半个地球…所以应该明确两个对映点可以远低于南北变化比北极南极。太平洋点关于你的第一个地图图像不能被正确的如果你看看地球仪。或者它可以帮助考虑挖掘的类比成一座小山的反思粗略地球是弯曲的……在蒙特雷和如果你挖出来在同一经度在太平洋,它非常类似于戳进你的山向中心……,在你开始的同一侧。如果你要通过中心,您需要出来对面,看着地球仪,蒙特雷和SH太平洋点并不这样做。就像这些原油图:[![enter image description here][1]][1] [![enter image description here][2]][2] Likewise with digging through the Earth... there's a latitudinal component north-south, and a longitudinal component (east-west) to all motion, and the ≈ 13,000 mile trip to . get to the other side of the Earth will be some sort of combination of the two. The North pole to south pole trip is the extreme case where all motion is latitudinal north-south. The equator trip is the extreme case where all motion is longitudinal east-west. All other cases will require some of each, in the right proportions to cross the center. Not unlike trying to cross from one side of a flat circular wall clock to the other. On it, you must be on the "opposite side" of the center both "up-down" and "left-right" to have passed through that center. So is the concept on the globe. [1]: https://i.stack.imgur.com/TlXww.png [2]: https://i.stack.imgur.com/2XBZpm.png