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Anything in the distance, a power pole, tree top, etc. It doesn't matter what, as long as it's far enough away to come to focus in your eyepiece.
Use a fairly high power eyepiece to get it the most accurate, however if it's currently way off, try a low power eyepiece first and then switch to a high power one.
The high power eyepieces will have the smaller number on them. The low power will have a larger number (like, over 15mm).
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