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《志第一 天文一(儀象 極度 黃、赤道 中星 土圭)》
23 | 臣嘗歷考古今儀象之法,《虞書》所謂璇璣玉衡,唯鄭康成粗記其法,至洛下閎制圓儀,賈逵又加黃道,其詳皆不存於書。其後張衡為銅儀於密室中,以水轉之,蓋所謂渾象,非古之璣衡也。吳孫氏時王蕃、陸績皆嘗為儀及象,其說以謂舊以二分為一度,而患星辰稠穊,張衡改用四分,而復椎重難運。故蕃以三分為度,周丈有九寸五分寸之三,而具黃赤道焉。績之說以天形如鳥卵小橢,而黃、赤道短長相害,不能應法。至劉曜時,南陽孔定制銅儀,有雙規,規正距子午以象天;有橫規,判儀之中以象地;有時規,斜絡天腹以候赤道;南北植幹,以法二極;其中乃為游規、窺管。劉曜太史令晁崇、斛蘭皆嘗為鐵儀,其規有六,四常定,以象地,一象赤道,其二像二極,乃是定所謂雙規者也。其制與定法大同,唯南北柱曲抱雙規,下有縱衡水平,以銀錯星度,小變舊法。而皆不言有黃道,疑其失傳也。唐李淳風為圓儀三重:其外曰六合,有天經雙規、金渾緯規、金常規。次曰三辰,轉於六合之內,圓徑八尺,有璇璣規、月游規,所謂璇璣者,黃、赤道屬焉。又次曰四游,南北為天樞,中為游筒可以升降游轉,別為月道,傍列二百四十九交以攜月游。一行以為難用,而其法亦亡。其後率府兵曹梁令瓚更以木為游儀,因淳風之法而稍附新意,詔與一行雜校得失,改鑄銅儀,古今稱其詳確。至道中,初鑄渾天儀於司天監,多因斛蘭、晁崇之法。皇祐中,改鑄銅儀於天文院,姑用令瓚、一行之論,而去取交有失得。 |
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