I'm generally messing about trying to find alternate stars to the easy ones, such as Alpha Centauri, Hadr, the cruxs as they disappear behind the neighbours house quite early... so I usually use Alpha Centauri and Acrux ( early in the night) or Alpha Centauri and Antares (I think, I have it written down) later on. Usually by the time Alpha Centauri disappears I'm done or given up. I have a very narrow part of the sky to work with.... but it is enough.
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