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Scope: 卷上 Request type: Paragraph
Condition 1: Contains text "陳子說之曰夏至南萬六千里冬至南十三萬五千里日中立竿測影" Matched:1.
Total 1 paragraphs. Page 1 of 1.

卷上

Books referencing 《卷上》 Library Resources
8 卷上:
榮方復歸,思之,數日不能得。復見陳子曰:「方思之以精熟矣。智有所不及,而神有所窮,知不能得。願終請說之。」陳子曰:「復坐,吾語汝。」於是榮方復坐而請。陳子說之曰:「夏至南萬六千里,冬至南十三萬五千里,日中立竿測影。此一者天道之數。周髀長八尺,夏至之日晷一尺六寸。髀者,股也。正晷者,句也。正南千里,句一尺五寸。正北千里,句一尺七寸。日益表南,晷日益長。候句六尺,即取竹,空徑一寸,長八尺,捕影而視之,空正掩日,而日應空之孔。由此觀之,率八十寸而得徑一寸。故以句為首,以髀為股。從髀至日下六萬里,而髀無影。從此以上至日,則八萬里。若求邪至日者,以日下為句,日高為股。句、股各自乘,并而開方除之,得邪至日,從髀所旁至日所十萬里。以率率之,八十里得徑一里。十萬里得徑千二百五十里。故曰,日晷徑千二百五十里。」

Total 1 paragraphs. Page 1 of 1.