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Scope: 尚書正義
Condition : Contains text 「𡖉」
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卷三

26
正義曰在察釋詁文●文云璿美王也玉是大名璿是玉之別稱璣衡俱以玉飾但史之立文不可以玉璣玉衡一指玉體一指玉名猶左傳云瓊弁玉纓所以變其文傳以璿言玉名故云美玉其實玉衡亦美玉也易賁卦●云觀乎天文以察時變日月星𪧐運行於天是為天之文也璣衡者璣為轉運衡為撗簫運璣使動於下以衡望之是王者正天文之器漢丗以來謂之渾天儀者是也馬融云渾天儀可旋轉故曰璣衡其撗簫所以視星𪧐也以璿為璣以玉為衡蓋貴天象也蔡邕云玉衡長八尺孔徑一寸下端望之以視星辰蓋懸璣以象天而衡望之轉機窺衡以知星𪧐是其●也七政其政有七於璣衡察之必在天者知七政謂日月與五星也木曰歳星火曰熒惑星土曰鎭星金曰太白星水曰辰星易繫辭云天垂象見吉凶聖人象之此日月五星有吉凶之象因其變動為占七者各自異政故為七政得失由政故稱政也舜旣受終乃察璣衡是舜察天文齊七政以審已之受禪當天心與否也馬融云日月星皆以璿璣玉衡度知其盈縮進退失政所在聖人謙讓猶不自安視璿璣玉衡以驗齊日月五星行度知其政是與否重審已之事也上天之體不可得知測天之事見於經者唯有此璿璣玉衡一事而巳蔡邕天文志云言天體者有三家一曰周髀二曰宣夜三曰渾天宣夜絕無師●周髀術數具在考驗天象多所違失故史官不用惟渾天者近得其情今史所用候臺銅儀則其法也虞喜云宣明也夜幽也幽明之數其術兼之故曰宣夜但絕無師●不知其狀如何周髀之術以為天似覆盆蓋以斗極為中中髙而四邊下日月旁行遶之日近而見之為晝日逺而不見為夜渾天者以為地在其中天周其外日月初登於天後入於地晝則日在地上夜則日入地下王蕃渾天●曰天之形狀似鳥𡖉天包地外猶𡖉之裹黃圎如彈九故曰渾天言其形體渾渾然也其術以為天半覆地上半在地下其天居地上見有一百八十二度半強地下亦然北極出地上三十六度南極入地下亦三十六度而嵩髙正當天之中極南五十五度當嵩髙之上又其南十二度為夏至之日道又其南二十四度為春秋分之日道又其南二十四度為冬至之日道南下去地三十一度而巳是夏至日北去極六十七度春秋分去極九十一度冬至去極一百一十五度此其大率也其南北極持其兩端其天與日月星𪧐斜而迴轉此必古有其法遭秦而滅揚子法言云或問渾天曰落下閎營之鮮于妄人度之耿中丞象之幾乎幾乎莫之能違也是揚雄之意以渾天而問之也閎與妄人武帝時人宣帝時司農中丞耿壽昌始鑄銅為之象史官施用焉後漢張衡作靈憲以●其狀蔡邕鄭𤣥陸繢吳時王藩晉丗姜岌張衡葛洪皆論渾天之義並以渾●為長江南宋元嘉年皮延宗又作是渾天論太史丞錢樂鑄銅作渾天儀傳於齊梁周平江陵遷其器於長安今在太史書矣衡長八尺璣徑八尺圎周二丈五尺強轉而望之有其法也

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