在古代，跟踪全年日出和日落的时间点以预测季节的能力是关系到生存的关键问题。
The ability to predict the seasons - by tracking the rising and setting points of the sun throughout the year - was key to survival in ancient times.
白天：日出和日落之间的那段时间。
钟表时间显示的太阳中午晚点也意味着钟表时间晚点的日出和日落。下表会帮助解释。
The later clock time for solar noon also means a later clock time for sunrise and sunset. The table below helps to explain.
白天，白昼：黎明和黄昏之间有光的一段时间；从日出到日落的间隔。
The period of light between dawn and nightfall; the interval from sunrise to sunset.
白天，白昼：黎明和黄昏之间有光的一段时间；从日出到日落的间隔。
The period of light between dawn and nightfall; the interval from sunrise to sunset.
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