Seriously. I believe a magnetic realignment will happen. Today, tomorrow, a million years? I don't claim to know. But if it does happen tomorrow I think the lights will still work. It's be like turn the plug in the socket 180 degrees.
Now, compasses on the other hand... And we'd have to name a South Star so we wouldn't get lost in the Northern Hemisphere :hmm:.
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If your target has a 30 degree AOB, the range from his base course line equals the current range divided by 2.
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