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Originally Posted by Soldant
Hey guys, do any of you remember me? Maybe the word "Optisan" will jog your memory. After being incredibly busy with lots of different things... I'm still incredibly busy, but I've come back to finish off the story of the Optisan.
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Second question: the manual says to align it with "north" when doing 2 star alignment. I've seen some people say "north" and others saying "true north". The manual just says "north". Which is it, and more importantly, what's the real difference between true north and north?
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Welcome back!
True North is north as per the axis of rotation, around which the Earth appears to revolve. This is the important one for polar alignment.
Magnetic North is where a magnetic compass points and this varies significantly for different geographic locations, and from year to year.
From Brisbane, you subtract the magnetic deviation, which I believe is approx 11 deg, from 360 deg, giving you 349 deg.
If you then make sure the magnetic pointer or arrow of the compass is at pointing at 349 degrees, then True North should lie at the 360 degree mark on your compass, assuming you have one that has a rotating bezel.
Cheers
Dennis