《宋书·志·卷十三》
《诗经》中说大火星偏西不过是粗略地说大火星在西移，作为寒冷将至的征候。
《诗》称流火，盖略举西移之中，以为惊寒之候。
The description of Mars setting west in the Book of Songs is just a rough description of Mars moving to the west, which is a sign of coming cold.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 《诗》称流火，盖略举西移之中，以为惊寒之候。 [/INST] The description of Mars setting west in the Book of Songs is just a rough description of Mars moving to the west, which is a sign of coming cold.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 《诗》称流火，盖略举西移之中，以为惊寒之候。
user
The description of Mars setting west in the Book of Songs is just a rough description of Mars moving to the west, which is a sign of coming cold.
assistant