The 1C Chronograph for A Photoelectric Astrolabe

The chronograph is a device used to record the average time of a star passing through the circle of egual altitudes.Its basic principle is expressed by the following equation;T_M=1/40/T_i-1/40Δt_i Positive logical P-Mos numerical integrated circuit components are mainly used in the chronograpli.The circuits of the chronograph include the input signal shaper circuit,controller circuit,frequency divider circuit,frequency coavorter circuit,mixer circuit,counting circuit and display circuit.