What he introduced included oval projection, stereographic projection, analemma and scenography etc.
关于投影几何，
带来
有椭圆投影、球极投影、平行正投影和透视法等。
,立体照
What he introduced included oval projection, stereographic projection, analemma and scenography etc.
关于投影几何，带来有椭圆投影、球极投影、平行正投影和透视法等。
Stereographic projection is known since the antiquity and was originally known as the planisphere projection.
立体绘图法原称为星座盘投影法。
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