根据历史资料，今年是中国历史上第一个千禧龙年。中国历史上有确切纪年的是公元前 841年，即西周庚申年。干支纪年法一般认为始于商代，十二生肖纪年法始于何时，目前尚无定论。《诗经·小雅·吉日》中有“吉日庚午，既差我马”之句，又《左传·僖公五年》有“龙尾伏辰”之语 According to historical data, this year is the first millennium dragon year in Chinese history. There is a definite record in Chinese history, 841 BC, that is, the Western Zhou Gengshen year. The law of dry and branch years is generally believed that began in the Shang dynasty, when the zodiac dating method began, there is no conclusion. “Book of Songs Xiaoya Jiri” in “Jiri-Gengwu, both the difference between my horse,” the sentence, and “Zuo Xi Gong for five years,” there is “End of the Dragon”