Write a description of how you'd help your friend figure out which hemisphere they're in, if they could talk to you on the phone. They have a set of constellation charts (like the ones here), so you don't have to try and describe to them what any particular constellation looks like.A good thorough answer will have more than just "Can you see such-and-such constellation?" If you can attack the problem from multiple directions, providing ways that they can double-check their assessment, that'll give you the best chance of getting maximum points

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