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
After studying the diffraction spectrum of non spherical particles, an ellipse particle diffraction model has been put fowerd.
通过对椭圆衍射谱的研究，提出在激光粒度分析中以椭圆谱代替球形颗粒谱。
3
Small holes are arranged on the spherical reflecting mirror and the crossing portion of the spherical reflecting mirror and the long shaft of the ellipse, and the small holes are lamp holes.