If your clock has a moving moon dial, read the following instruction:

1. Using a calendar, look up the date of the last full moon. Count the number of days past the last full moon.
2. By applying slight pressure with your hand, rotate the moon disc clockwise until the moon is perpendicular or directly below the number 15.
3. Turn the moon disc clockwise one click for everyday (24 hours) past the full moon.

The moon dial is now set and will continue to operate unless the clock stops. If the clock stops, the moon dial must be reset when the clock is started again.