The earth was flat once. But I tuned it, though, so it's okay now. If you really still think it's flat, just take a tuner to it and see for yourself
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@frinkeldoodle The maybe it was only flat because you were using a different pitch for concert A? Check if your tuner is set to 440 hz for concert A. You might have accidentally turned the earth Sharp. Be careful around hills.
@Anarkat But I heard 432Hz was more natural, and I wouldn't want to tune the earth to a manufactured frequency