Adding METERS_TO_MILES constant

radixmath/constants.hh

@@ -33,6 +33,7 @@ namespace radix
     const Real sqrtHALF = std::sqrt(Real(0.5));
     const Real sqrtTWO = std::sqrt(Real(2.0));
     const Real sqrtTHREE = std::sqrt(Real(3.0));
+    const Real METERS_PER_MILE = 1609.344;
     /**
      * Type def unsigned long to Identifier
      */