《后汉书·本纪·孝献帝纪》
冬季，彗星出现于东北。
冬，有星孛于东北。
In winter, a comet appeared in the northeast.
<s>[INST] Kindly elucidate the central themes in this passage in English: 冬，有星孛于东北。 [/INST] In winter, a comet appeared in the northeast.</s>
Kindly elucidate the central themes in this passage in English: 冬，有星孛于东北。
user
In winter, a comet appeared in the northeast.
assistant