A Sidereal Clock: Teardown, Analysis, Adjustment

02:33 Explanation of what a "Sidereal Clock" is used for 11:50 Teardown & circuit analysis 20:05 Checking the frequencies of the main crystal oscillator and the divider stages 22:47 Adjusting the frequency 24:12 Frequency variation with mains voltage 25:20 Frequency variation with temperature & recovery