Heversine Rails to check if there are people around me

herversine_ruby.rb

def distance loc1, loc2
  rad_per_deg = Math::PI/180  # PI / 180
  rkm = 6371                  # Earth radius in kilometers
  rm = rkm * 1000             # Radius in meters

  dlat_rad = (loc2[0]-loc1[0]) * rad_per_deg  # Delta, converted to rad
  dlon_rad = (loc2[1]-loc1[1]) * rad_per_deg

  lat1_rad, lon1_rad = loc1.map {|i| i * rad_per_deg }
  lat2_rad, lon2_rad = loc2.map {|i| i * rad_per_deg }

  a = Math.sin(dlat_rad/2)**2 + Math.cos(lat1_rad) * Math.cos(lat2_rad) * Math.sin(dlon_rad/2)**2
  c = 2 * Math::atan2(Math::sqrt(a), Math::sqrt(1-a))

  rm * c # Delta in meters
end

people = [[52.4920692, 13.40], [52.4920893, 0.40], [52.4920894, 13.40], [52.4920895, 0.40]]

mylocation = [52.5038, 13.41]

people.each do |lat, lon|
  if (distance mylocation, [lat, lon]) < 50000
    puts "#{lat} and #{lon} is close here"
  end
end