在各种不同的平面地图上,或在球面的地球仪上,都画有经线和纬线,分别标注了经度和纬度。在平面地图上,经线是什么图形?在地球仪上观察经线,会得到什么结论?本文探讨经线的含义,介绍平面几何中半圆的概念,指出《地理》课本上经线概念的瑕疵,就能解决这些问题。在实际生活中,经线这个名词有两种含义,一种含义是编织物的纵线,在纺织行业中,用线织物,通常把横线叫做纬线,纵线叫做经线,经线, On various planar maps, or on spherical globes, are warp and latitude lines, each labeled longitude and latitude. What are the warp threads on a flat map? What conclusions can be drawn from observing the warp threads on a globe? This article explores the meaning of warp threads, introduces the concept of semicircles in plane geometry, points out the flaws in the notion of warp threads in geography textbooks, problem. In real life, the term meridian has two meanings, one meaning is the vertical line of braid, in the textile industry, the use of wire fabric, horizontal line is usually called latitude, vertical line is called warp, warp,