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1996年,国家启动了重大科研攻关项目《夏商周断代工程》,来自历史文献、古文字、考古、碳14测量、天文等不同学科的200位专家参加了这项工作。在断代工程的44个专题中,12个为天文专题或以天文为主,它们贯穿在夏、商、周三代之中。翻开《辞海》附录的中国历史纪年表,我国有确切年代的历史从公元前841年(共和元年)开始。再往前,一代代的帝王历历可数,直溯夏朝之初,但是具体年代就不得而知了。这是公元前一世纪伟大的历史学家司马迁在《史记》中留给我们的记载。更早的年代,一直搞不清楚。两千年来,历代史学家耗尽心力,也未能使这一问题有突破性进展。
In 1996, the state launched a major scientific research project “Xia, Shang and Zhou Dynasties Project”, from the history of literature, ancient writing, archeology, carbon 14 measurements, astronomy and other disciplines of 200 experts participated in this work. Among the 44 thematic projects, 12 are astronomical or astronomical, which run through the summer, the Shang and the Zhou dynasties. Open the “Cihai” appendix of Chinese history chronology, the exact age of our country from 841 BC (the first year of the Republic). Further forward, the emperors of generations passed the count, dating back straight to the beginning of the Xia and the North Dynasties, but the exact age was unknown. This is the record that Sima Qian, the great historian of the first century BC, left us in Records of the Historian. Earlier years, has been confused. For two thousand years, historical historians have tried their best and failed to make breakthroughs in this issue.