Increase precision and add proper comment.

d80dbf60 · Alex Reisner · 8ffaede5 · d80dbf60
Commit d80dbf60 authored 11 years ago by Alex Reisner
--- a/lib/geocoder/calculations.rb
+++ b/lib/geocoder/calculations.rb
@@ -20,7 +20,11 @@ module Geocoder
    # Conversion factor: multiply by kilometers to get miles.
    #
    KM_IN_MI = 0.621371192
-    KM_IN_NM = 0.540
+
+    ##
+    # Conversion factor: multiply by nautical miles to get miles.
+    #
+    KM_IN_NM = 0.539957

    # Not a number constant
    NAN = defined?(::Float::NAN) ? ::Float::NAN : 0 / 0.0