module Geocoder::Calculations

def longitude_degree_distance(latitude, units = nil)


This ranges from around 69 miles at the equator to zero at the poles.
Distance spanned by one degree of longitude at the given latitude.
# 
def longitude_degree_distance(latitude, units = nil)
  units ||= Geocoder.config.units
  latitude_degree_distance(units) * Math.cos(to_radians(latitude))
end