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1·The cofocal ellipse and hyperbola of spherical surface will also be projected into the cofocal ellipse and hyperbola in gnomonic projection.

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。

2·According to the principle of V. Goldschmidt 's gnomonic projection and crystal computer graphics, a new system of computer graphics of crystal shape is presented in the paper.

根据极平投影作晶体图和计算机绘图原理，本文建立了一种新的晶体形态计算机绘图系统。

3·An approach is first posed by using gnomonic projection, based on the problem remaining unresolved, which is about the coating joint modeling and the joint overlap of spherical equilateral polygon.

针对球面等边多边形包覆拼接建模及出现拼接重叠等问题，分析了心射球面投射原理和共球面等边多面体的结构特征，提出了共球面等边多面体作心射球面投射的方法。