《晋书·志·第六章》
十二月，对应律为大吕，司马迁记载的未位下生而得的律，长四又二百四十三分之五十二寸，二倍为八又二百四十三分之一百零四寸。
十二月，律中大吕，司马迁未下生之律，长四寸二百四十三分寸之五十二，倍之为八寸二百四十三分寸之一百四。
December corresponds to Da Lu law, which was recorded by Sima Qian and derived from the sound when born from the lowest position and is 4 and 52/243 inches long, which when doubled is 8 and 104/243 inches long.