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意思解释：（Day is poor）日影逐日长短之差。古代立表测日影以验气，影最短为夏至，最长为冬至，逐日递差，历家常根据日差推求气至的时刻。
日影逐日长短之差。古代治历之法，植表测影以验气，影最长为冬至，最短为夏至，逐日递差，据日差推究气至的时刻。《元史·历志一》:“刘宋祖冲之尝取至前后二十三四间晷景(影)， 折取其中， 定为冬至; 且以日差比课， 推定时刻。…
Day movie is day-to-day the difference of accident. Ancient time administers the law of all previous, establish watch measures a shadow to be enraged with check, the vague impression is the most lasting for solstitial, the shortest for the Summer Solstice, day-to-day give difference, according to day poor examine enrages the hour that reach. yuan annals of history · all previous one : Be proud burn of ≈ of ⑷ of of Lu of game Wu Ping holds) of shadow of of core of zhuang1huang2 of collect of of Huo high, fold take among them, it is solstitial; surely and with day difference compares a class, illative hour. ...
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