In the study of variation of the earth's rotation based on the records of some ancient astronomical events, the timing records of ancient astronomical events and phenomena, such as solar and lunar eclipses and lunar occultation, are important components of the data. The reliable records, especially those from the countries and regions with advanced ancient astronomy and timing technology, contain valuable information on the variation of the earth's rotation. In China, a country with ancient civilization, since not only emperors believed that some phenomena were related to the rise and fall of their dynasties, but also the astronomical events and phenomena were needed for ancient calendars and astrology, great attention had been paid to the observations of solar and lunar eclipses, and the observations and records had a long history. As the timing technology was good and the timing observations were generally recorded by official astronomers, the reliability of Chinese observations data is generally high. Through serious textual criticism and selection, we may probably obtain the significant result for the study of variation of the earth's rotation from the ancient data.
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