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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Solar altitude, Azimuth, Geography longitude, latitude, altitude, cloud coverage, atmospheric transparency.

太阳高度角，太阳方位角，地理经度纬度，海拔高度，云量，大气透明度。

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The basic framework of international time zones is that there is about one hour difference in solar time for every 15 DE GREes 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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But, also like ancient mariners (who knew their latitude, but not their longitude), such solar reckoning cannot tell them when to stop.

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