The Tianwenzi(天文志) of the Jinshu(晉書) has two parts: one explaining the Chinese astronomical theory, and the other recording the historical cases of the astronomical phenomena. In this paper I analyze the latter part, titled Shichuanshiyan(史傳事驗), the historical records of celestial changes and predictions, particularly the cases concerning the sun and the moon. I will show that the Chinese bureaucrats with professional knowledge in astronomy, the so-called tianwenjia(天文家), used the astronomical phenomena in showing their expertise and rationalizing their position in the government: they recorded the details of celestial phenomena and interpreted them as signs of important political events on the earth. The solar and lunar cases in the Tianwenzi of the Jinshu show five important features. First, it followed the ancient tradition of Chinese astronomy regarding the solar eclipse as the most important phenomenon. The recorded solar eclipses in the Jinshu amount to 80, approximately once in every 2.51 years. Thanks to the accurate astronomical knowledge, the solar eclipses occurring on the first day of the month increased to 81.3%. Second, most of the solar eclipses were interpreted as signs of events with direct effects on the sovereigns. Such tendency was not new, but it became more frequent than before. Third, the Jinshu began to show much interest in new kinds of phenomena, such as shihui(十輝, ten haloes) and lunar trespasses of the five planets or various constellations. Fourth, the fenye(分野, field allocations) theory, which had been the main theoretical tool for the interpretation of celestial phenomena, continued to be applied to the lunar phenomena, but the theory was hardly ever applied to the solar phenomena. Fifth, the general astronomical theory worked well for the solar eclipses and the lunar trespasses of the Jupiter, but not for the other celestial phenomena.