《宋书·志·卷三十四》
晋成帝咸康元年七月，白虹贯曰。
晋成帝咸康元年七月，白虹贯日。
In July of the first year of Emperor Cheng of Jin's Xiankang era, a white rainbow passed through the sun. 
<s>[INST] Rewrite the following English passage in the style of Classical Chinese: In July of the first year of Emperor Cheng of Jin's Xiankang era, a white rainbow passed through the sun.  [/INST] 晋成帝咸康元年七月，白虹贯日。</s>
Rewrite the following English passage in the style of Classical Chinese: In July of the first year of Emperor Cheng of Jin's Xiankang era, a white rainbow passed through the sun.
user
晋成帝咸康元年七月，白虹贯日。
assistant