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格林尼治标准时间
后来,格林尼治天文台所在地的地方平太阳时被定义为全世界的时间标准,被称为格林尼治平时(Greenwich Mean Time),“平时(mean time)”就是“平太阳时(mean solar time)”的意思。 后来,由于1925年以前人们在天文观测中,常常把每天的起始(0时)定为正午 ...
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