子午线就是经线，只是叫法不同而已。把经过英国格林尼治天文台的那条经线叫做本初子午线然后向东、西各划180个经度，把地球分成360个经度。
adj. meridian
misc. line of longitude
在球体表面上的一条直线，就是你可能画出的最大圆，就像是赤道或经度线。
And on the surface of a sphere, a straight line is the biggest possible circle you can draw.
福克在向东走的路上一直是迎着太阳升起的方向前进，所以每当他这样走过一条经度线，他就会提前四分钟看见日出。
In journeying eastward he had gone towards the sun, and the days therefore diminished for him as many times four minutes as he crossed degrees in this direction.
沿着赤道使用维度和经度相当简单，形成的网格线大致也是方形的。
Using latitude and longitude is easiest along the equator, where the grid lines formed are roughly square.
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