A Precision Sidereal Electronic Clock

Abstract

A clock has been built to provide sidereal and solar seconds derived from 1 MHz high stability crystal oscillator. Days, hours, minutes and seconds are displayed using Nixie tubes. The reliability is enhanced because of integrated circuits usage. Different timing pulses from the clock are used for data acquisition by the computer, pulsar photography and time marks on the chart recorders. The accuracy of the clock is 1 part in 10⁹.