class TZInfo::TZDataLocation

:nodoc:
@private
A location (latitude + longitude)

def initialize(coordinates)

then longitude (+ is east).
or +-DDMMSS+-DDDMMSS, first latitude (+ is north),
sign-degrees-minutes-seconds format, either +-DDMM+-DDDMM
Constructs a new TZDataLocation from a string in ISO 6709 
def initialize(coordinates)
  if coordinates !~ /^([+\-])([0-9]{2})([0-9]{2})([0-9]{2})?([+\-])([0-9]{3})([0-9]{2})([0-9]{2})?$/
    raise "Invalid coordinates: #{coordinates}"
  end
  
  @latitude = Rational($2.to_i) + Rational($3.to_i, 60)
  @latitude += Rational($4.to_i, 3600) unless $4.nil?
  @latitude = -@latitude if $1 == '-'
  
  @longitude = Rational($6.to_i) + Rational($7.to_i, 60)
  @longitude += Rational($8.to_i, 3600) unless $8.nil?
  @longitude = -@longitude if $5 == '-'
end