Well... Menelvagor (Orion) and Valacirca (What do you call it in English? The Dipper or something like that?) could be seen from the Hobbits' lands, and they are constellations visible only from the Northern hemisphere. This places the 'Northwestern' Middle-Earth on the Northern hemisphere of our times as well.
As for Valinor's position on the modern Earth - it was removed from the 'Circles of the World', and is not accessible to humans. Therefore it can't be any of the modern continents.
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