What he introduced included oval projection, stereographic projection, analemma and scenography etc.
关于
影几何，
带来的有椭圆影、球极影、
行正影和
法等。
影；立体影；球极影；极射赤影What he introduced included oval projection, stereographic projection, analemma and scenography etc.
关于影几何，带来的有椭圆影、球极影、行正影和法等。
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影法。
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