The parallactic refraction between the stars and the satellite is small and well determinate, except for the irregular stellar movements known as erratics. 除了通称为游动的不规律星体运动之外,恒星和卫星之间的视差折光差微小,而且是容易测定的。
Two parallactic films of a nature color scene are obtained with a three color grating camera. 用新颖的线性三色采样叶形光栅,可以在单色胶片上一步记录彩色图像。