Gnomonic charts are published covering the Atlantic, Pacific and Indian Oceans, except for an equatorial belt in each ocean.
出版大圆海图覆盖大西洋，太平洋和印度洋（各大洋近赤道带水域除外）。
2
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。
3
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.