What interested her most was the longitude line.

她最感兴趣的是那条经线。

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Greenwich thus became established as the location of the prime meridian of longitude, and the base line for calculating time zones around the world.

由此格林威治不仅作为起初子午线的所在地，也成为全球计算时区的基准线。

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The prime meridian is at 0 degrees longitude, and the international date line is at 180 degrees. The equator is at 0 degrees latitude.

本初子午线处于0度经度，而国际日期变更线处于180度经度。赤道处于0度纬度。

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They achieved one of the most hotly contested aviation goals on Saturday when they passed over Mauritania and crossed the 9 degrees west longitude mark -- the official finish line for their flight around the world.

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