《诗经·七月》以首句得名:“七月流火,九月授衣。”孔颖达疏:“于七月之中,有西流者,是火之星也,知是将寒之渐。”需要注意的是,这个“七月”是夏历的“七月”,而不是现在公历的“7月”。《辞源》释“流火”:“……火,星名,或称大火星……夏历七月的黄昏,星的位置由中天逐渐西降,知暑渐退而秋将至。” “The Book of Songs July” is named after the first sentence: “July Fire, Licensing in September.” Kong Yingda Shu: “In mid-July, there are Westerners who are also the stars of fire, ”It should be noted that this“ July ”is the“ July ”of the lunar calendar instead of the“ July ”of the current Gregorian calendar. “Etymology” release “flowing fire”: “... fire, the star name, or Mars ... ... the summer dusk of July, the position of the stars gradually descend from transit, the summer heat gradually receded autumn is approaching.”