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。
The basic framework of international time zones is that there is about one hour difference in solar time for every 15 degrees of longitude.
每跨经度15度，时间改变一个小时，由此便产生了全球的24个时区。
Every 15 longitudinal degrees, the time changed by an hour, thus creating 24 time zones around the world.
这是一个季节性每年都重复发生的时间周期，并且因为地球围绕它自己的轴旋转24小时，因此我们使用15度的经度，代表一小时或者15天。
This is the seasonal yearly time periods and because the earth revolves on its axis in 24 hours, we use 15 degrees of longitude, which is 1 hour of time or approximately 15 days.
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