An isometric mesh on the concave of a spherical substrate was formed by latitudeline intersection each other, in which latitude lines was generated by a concentric optical scanning method.
摘要纬线与纬线相交可形成球面等距网栅，而采用“同心扫描”的运动方式可在凹球面上生成纬线。
2
The prime meridian is at 0 degrees longitude, and the international date line is at 180 degrees. The equator is at 0 degrees latitude.
本初子午线处于0度经度，而国际日期变更线处于180度经度。赤道处于0度纬度。
3
If there is a line passing the top of the ruler, and parallel to the equator, then the Angle between the line and the ruler is equal to the latitude here.