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《一行》

Library Resources
1 一行:
沙门一行,俗姓张名遂,郯公公瑾之曾孙。年少出家,以聪敏学行,见重于代。玄宗诏于光大殿改撰历经。后又移就丽正殿,与学士参校。一行乃撰《开元大衍历》一卷,《历议》十卷,《历成》十二卷,《历书》二十四卷,《七政长历》三卷。凡五部五十卷。未及奏上而卒。张说奏上之,诏令行用。初,一行造黄道游仪以进。御制制原作进。据《大唐新语》改。《游仪铭》付太史监,将向灵台上,用以测候。分遣太史官大相元太等,驰驿往安南、朗。兖等州。测候日影。同以二分二至之日午时,量日影,皆数年方定。安南极高二十一度六分。冬至日影长七尺九寸二分。春秋二分长二尺九寸三分,夏至日在表南三寸一分,蔚州横野军北极高四十度,冬至日影长一丈五尺八分,春秋二分长六尺六寸二分,夏至影在表北二尺二寸九分。此二所为中土南北之极。朗。兖。太原等州,并差互不同。用句股法算之云。大约南北极。相去才八万馀里。修历人陈玄景亦善算。叹曰。古人云。以管窥天,以蠡测海。以为不可得而致也。今以丈尺之术而测天地之大,岂可得哉。若依此而言,则天地岂得为大也。其后参校一行历经。并精密,迄今行用。出《大唐新语》

URN: ctp:taiping-guangji/216/yixing