It looks like an aproximate equidistant point in round coordinates among Banzendorf (N), Ronnebeck (E), Keller (S) and Klosterheide (W). Lindow is far south.
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this is what you have to do n-29=-53 n=-53+29 n=-24
-53+n = -28 n = -28+53 n = 25
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The sum of the interior angles of a n-sided polygon is (n-2)*180 degrees. So for 13 sides, the sum is 11*180 = 1980 degrees.