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(闰(rùn )法(fǎ )，闰(rùn )法(fǎ ))

指(zhǐ )设(shè )置(zhì )闰(rùn )月(yuè )的(de )方(fāng )法(fǎ )。

《汉(hàn )书(shū )·律(lǜ )曆(lì )志(zhì )上(shàng )》：“并(bìng )终(zhōng )数(shù )为(wéi )十(shí )九(jiǔ )，《易(yì )》穷(qióng )则(zé )变(biàn )，故(gù )为(wéi )闰(rùn )法(fǎ )。”

颜(yán )师(shī )古(gǔ )注(zhù )引(yǐn )孟(mèng )康(kāng )曰(yuē )：“天(tiān )终(zhōng )数(shù )九(jiǔ )，地(dì )终(zhōng )数(shù )十(shí )。穷(qióng )，终(zhōng )也(yě )，言(yán )闰(rùn )亦(yì )日(rì )之(zhī )穷(qióng )馀(yú )，故(gù )取(qǔ )二(èr )终(zhōng )之(zhī )数(shù )以(yǐ )为(wéi )义(yì )。”

王(wáng )先(xiān )谦(qiān )补(bǔ )注(zhù )：“李(lǐ )锐(ruì )曰(yuē )：并(bìng )天(tiān )九(jiǔ )地(dì )十(shí )，得(dé )十(shí )九(jiǔ )为(wéi )闰(rùn )法(fǎ )。”

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