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章十

历四

大统历法二(立成)

立成者,以日月五星盈缩迟疾之数,预为排定,以便推步取用也。《元志》、《历经》步七政盈缩迟疾,皆有二术。其一术以三差立算者,即 布立成法也。其又术云,以其下盈缩分,乘入限分万约之,以加其下盈缩积者,用立成法也。而遣立成未载,无从入算。今依《大统历通轨》ju录之。其目四:曰太yang盈缩,曰晨昏分,曰太yin迟疾,曰五星盈缩。(余详《法原》及《推步》卷中。an《元史》,至正十七年《授时历》成。十九年王恂卒,时历虽颁,然立成之数尚皆有定藁。郭守敬比类编次,整齐分秒,裁为二卷。而今钦天监本,载嘉议大夫太史令臣王恂奉敕撰。意者王先有藁,而郭卒成之欤?)

太yang盈初缩末限立成(冬至前后二象限同用)

(表格略)

晨分加二百五十分,为日chu分。日周一万分,内减晨分为昏分。昏分减二百五十分,为日入分,又减五千分,为半昼分。故立成只列晨昏分,则chu入及半昼分皆ju,不必尽列也。

(以下表格略)

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