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If you have view of a street light or similar object (as far away as you can get) then you can use that to align the two. Visually align the scope by looking along the tube and start with the lowest power (longest focal length) eyepiece to give you the best shot at finding it in the main scope.
Then swap to a high power eyepiece and center the object up in the main scope before aligning the finder on to it.
Fixed objects are the best so you are not trying to align on a moving target.
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