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I'll likely be decried as a heretic for saying this, but here in badly light polluted suburbia, a planisphere is useless, since we're lucky to see barely a fifth or less, of the stars displayed in it.
At a dark site, or at least somewhere not badly light polluted a planisphere might be usable. Unfortunately, no-one makes planispheres for the various Bortle levels of light pollution, so the worse the light pollution is where you are, the less useful a planisphere becomes, because it shows so many stars that are simply not visible.
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