Like the sun the stars also make meridian passages and point the way to true north. You do not need to identify stars to do this, only be sure that they are at their zenith (see Figure 8.14).
Any two stars making their meridian transit at the same instant are in a north-south line. Meridian stars in the northern hemisphere point north, those in the southern hemisphere point south. You use this principle when the Southern Cross stands vertical and you follow the two stars (Gacrux on top and Acrux on the bottom) that make the upright of the Southern Cross to find due south.
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