常识“环中黍尺”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	环中黍尺
释义	环中黍尺书名。清梅文鼎著。五卷。康熙三十九年（1700）成书。是书用正投影方法讨论球面三角问题。主要内容为：余弦定理的证明，球面三角形图解及将积化为和差公式的证明。由正射影法得到的投影图，梅氏称为“正形”。在“正形”图上，可用线段的长表示原弧三角形边、角的正弦、正矢，从而利用一些平面几何知识即可推导出原弧三角形边角间的关系。依据已给条件，作出一弧三角形的“正形”后，又可用直尺在图上直接量出所求弧、角的正弦或正矢。故本书名为《环中黍尺》。有《勿庵历算全书》、《梅氏丛书辑要》等刻本。
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