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I tend to conduct PA on a star as close to Celestial South Pole as I can & also, as readily identifiable as I can...
Where I live, Southern Cross is not always visible all year round but, when it is, I have a tendency to use Acrux everytime..
If not visible, I choose something else distinct & as close to the South & at about 40-45* elevation. My thought process is I'm trying to get lined up with South Celestial Pole... might as well pick something I can see & recognise &, as close to SCP as I can.
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