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The Chasam Sofer says it is not rosh chodesh anywhere until the chodesh has been niskadesh in Eretz Yisrael, which should make it impossible to say hallel during shacharis on rosh chodesh in Australia — but it's not. Thus the implication is that halachically (relative to global mitzva observance) we consider the world to be flat (or at least ...

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