Here's the line of latitude drawn precisely over Middle Island's southernmost location.

这是在中间岛最南端精确绘制的纬线。

They are called lines of latitude. Do you know the most famous line of latitude?

它们被称为纬线。你知道最著名的纬线吗？

Ptolemy built his grid out of lines we still use today: 180 lines of latitude and 360 lines of longitude.

托勒密用我们今天仍在使用的线构建了他的网格：180 条纬线和 360 条经线。

It recommended using geometric lines of latitude and longitude to convey a three-dimensional Earth on a two-dimensional surface, and it included the co-ordinates of over 8,000 locations in the ancient world.

它告诉人们如何用经纬线这样的几何线条在二维的平面上表现出三维的地球来，书中还有古代世界8000多个地点的坐标。

What you need is some way to use the sphericalness of the planet, some of its notable features, and the fact that lines of latitude aren't really lines— they're circles.

你需要的是某种方式来利用行星的球形，它的一些显着特征， 以及纬度线不是真正的线 - 它们是圆的事实。