The two nonstandard longitude zones are visible in Figure 3: zone 32V is extended to cover all of southern Norway, while zone 31V is shrunk so that it covers only open water.
从图 3 中可看到两个非标准的经度区：32V 区被扩展为覆盖整个挪威的南部，而 31V 区被缩小，所以只覆盖了一片汪洋大海。
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。
The basic framework of international time zones is that there is about one hour difference in solar time for every 15 degrees of longitude.
国际时区的基本框架是经度每隔15度，太阳时就相差一小时。
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