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Another disadvantage is that the two stars (Alpha Centauri and Acrux) are rather close to each other, compromizing the accuracy.
This also requires that both stars should be in the sky at all times which is not always the case in all SH.
Another method, apart from the polar scope method, using setting circles and a single star, max 30 deg altitude + zenith (or two stars at least 60 degrees apart) alignment has the same accuracy, which works worldwide, incl NH.
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