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How far is the geographical distance between China and Hangzhou?

Hangzhou (120'E, 30'N), Berlin, Germany (14'E, 53'N), Hangzhou uses a, Berlin, Germany uses C (14'E, 30'N) B for AB longitude difference =106. 2 AC = 504.612129917km, so the geographical distance from Hangzhou to Germany is 504.612129917km.