芒种小暑八刻五分
钦定协纪辨方书 · section 76 · 允祿 等 奉敕撰 · 759 characters
Original text
夏至 八刻九分
钦定协纪辨方书卷十二 <子部,术数类,阴阳五行之属,钦定协纪辨方书> 钦定四库全书
星图步天歌 <子部,术数类,阴阳五行之属,钦定协纪辨方书,卷十三> 星鸟星火肇于虞书昏中旦中详于月令中星之来尚矣周礼司寤氏掌夜时以星分夜汉仪昼漏尽夜漏起省中黄门持五夜又名五更此更漏中星所由昉也然古今更之制亦微有不同元授时之法于日入后日出前减去晨昏分各二刻半余为夜时分为五更每更又分为五于初更三时起更五更三时攒今台官相传之法则于日入后八刻起更日出前九刻攒防计起更至攒共若干时刻五分之以为五更日出前减朦影刻分为旦刻日入后加朦影刻分为昏刻如第一图举春秋分为例外大圜地平经圏也内半圜地平下赤道也中直线子午圏也二横线上为地平纬圏下则朦影限地平距等圏也与赤道交于昏旦自天顶至昏旦作经圏其地平下为十八度与大圏朦影限度等自北极至昏旦作经圏其所截昏旦距日出入之度即朦影刻分也日入至日出计四十八刻减一更距日入后八刻攒防距日出前九刻余三十一刻以五分之得六刻三分自一更递加之即得各更时刻也如以度数而论日入后八刻起更在赤道为三十度日出前九刻攒在赤道为三十三度四十五分于地平下赤道半周一百八十度内减之余一百一十六度一十五分以五分之得二十三度一十五分为每更相距赤道度每一度当时之四分亦得六刻三分为每更相距时刻也第二图外层三百六十度地平经度也次内十二时九十六刻地平刻分也时刻之在赤道其度常均而在地平则阔狭不等其法为半径与时刻距午赤道度切线之比同于北极出地之正与日影距午地平经度切线之比故子午卯酉四正之位不移而子午前后则狭卯酉前后则阔也次内圆者为节气线曲者为节气时刻线盖日出入昏旦更时刻各节不同自中心对各时刻于各节圏上作识之联之必成曲线也最内一层为地平二十四方位以明此图即晷表之理日在南则影在北日在东则影在西也夜无日影以昼例夜也今依其法推得京师各节气昏旦更时刻中星着于篇星图步天歌并附于后
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