The solar equation table of the Dayan Calendar is a mathematical table of equally quartic difference, and it reflects Yi Xing's profound understanding about the solar motion.
《大衍历》日躔表是一份四次差分相等的数表，反映一行对太阳运动复杂性的深刻认识。
2
Plane grinding, the workpiece can be installed in a reciprocating linear motion of the rectangular workbench, also can be installed in a circular motion of the round table.
平面磨削时，工件可安装在作往复直线运动的矩形工作台上，也可安装在作圆周运动的圆形工作台上。
3
The working table has a simple structure, high resolution of displacement, and can achieve two-way motion.