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Maybe a stupid question, bear in mind I am a newbie.
All I have read re barn doors is they need to be aligned with a ref point, north or south celestial pole. As we don't have a definite sky ref to do this, how do we do it?
Elevation seems to be easy, just use a protractor with a pointer set up on the barn door. Aiming south is a little more difficult. I have seen some suggest a compass and correct for magentic deviation, but any ferrous metal in the barn door would affect the compass. If the rod and hinges are brass, maybe no problem. However, the motor will have a magnetic field, as will the wires going to it. Hence I guess the need for a ref point in the sky. Am I on the right track here?
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