常识“托克托日晷”是什么意思，起源、典故、生平简介及释义-历史文化

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常识“托克托日晷”是什么意思，起源、典故、生平简介及释义-历史文化

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词汇	托克托日晷
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释义	托克托日晷天文仪器。为一尺见方石板。石板中央有一较深圆孔，圆孔之外有一半径近四寸的大圆，周边刻有六十九个浅孔，孔距相等，共占圆周三分之二略多。从每个浅孔有直线引至圆心；浅孔上标数码，按顺时针排列，书法为小篆，可能为秦汉之际遗物，清光绪二十三年（1897）在内蒙古托克托城（今托克托县）出土，现藏中国历史博物馆。此日晷显然按一天百刻分划。其所测量的时间，并非从夜半开始的时刻，而是以日出前三刻（或后来的二刻半）为零点的与汉代漏刻相适应的时刻。日晷的安置方向应平行于天赤道，仪器正中十字线对准东西和南北方向，浅孔则置于仪器北端。当太阳在赤道以北时，立于圆心且垂直盘面的圆柱形“定表”，投影在仪器平面上，可直接读数；而当太阳在赤道以南时，仪器本身挡住了太阳，“定表”影子投落在仪器之外，就须用“游表”来进行观测，“游表”可移动插在浅孔里；只要选取足够长的“游表”和“定表”，就不难由“游表”和“定表”构成的平面，与太阳中心相合，就可得到时刻读数。
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