# How to Calibrate a Wind-Up Grandfather Clock
Instructions
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Find the correct time, either by checking online, using your cellphone or calling a time hotline in your area.
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Set the grandfather clock to the correct time by moving the minute hand forward. Do not move the hour hand; it will move with the minute hand and moving it by hand will damage your clock's internal parts. If your clock has the option of automatic chiming, turn that lever to the "Off" or "Manual" position. If it's in "Automatic," the chiming system could be damaged when you're forwarding the clock ahead.
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3
Turn the adjustment nut at the bottom of your clock's pendulum to adjust the speed of your clock. If you suspect that the clock is running too fast, turn the adjustment nut to the left. This will lower the pendulum disc and slow the movement. If you think the clock is slow, turn the nut to the right. Track this over the next week to make sure that you have adjusted it correctly.
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4
Adjust your moon dial (if your clock has one) so that it indicates the correct phase of the moon. The dial should form a semicircle with days above it, from 1 to 29. Look at a calendar to find the date of the last full moon. Move the full moon's picture to that date.
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