foci of a hyperbola
... Foci of an Ellipse 椭圆焦点 Foci of a Hyperbola 双曲线焦点 Focus 焦点 ...
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球面上共焦点之椭圆、双曲线，在球心投影中仍投影成共焦椭圆、双曲线。
The cofocal ellipse and hyperbola of spherical surface will also be projected into the cofocal ellipse and hyperbola in gnomonic projection.
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