What he introduced included oval projection, stereographic projection, analemma and scenography etc.
关于
几何，
带来的有椭圆、
极、平行正和透视法等。
画法的,照相的面；
；极平面；极射赤面What he introduced included oval projection, stereographic projection, analemma and scenography etc.
关于几何，带来的有椭圆、极、平行正和透视法等。
Stereographic projection is known since the antiquity and was originally known as the planisphere projection.
图法原称为星座盘法。
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