Numerology with Ruby

This is a simple Numerology calculator written in ruby. Just a pass time program while learning ruby.
This will give you the value of the given name and date (date of birth)
Usage:
./numerology.rb <your_name> <date> <month> <year>

#!/usr/bin/env ruby
class Numerology
 @name
 @date
 @month
 @year
 $map = {'A' => 1, 'J' =>1, 'I' =>1, 'Y' => 1, 'Q' => 1,
   'B' => 2, 'K' => 2, 'R' => 2,
   'S' =>3, 'C' =>3, 'L' =>3, 'G' => 3,
   'T' => 4, 'D' => 4, 'M' => 4,
   'E' =>5, 'N' => 5, 'X' =>5, 'H' => 5,
   'U' => 6, 'V' => 6, 'W'=>6,
   'O' =>7, 'Z' => 7,
   'F' =>8, 'P' => 8 ,
   ' ' => '' #for removing spaces
   }
   
 def initialize(name,date,month,year)
  if name.nil? or name.empty?
   raise "Please provide a name"
  end
  @name = name.upcase
  @date = date.to_i
  @month = month.to_i
  @year = year.to_i
  if @date == 0 or @month == 0 or @year == 0
   raise "Please provide a valid date"
  end
 end

 def calculate
  puts "Name : #{@name} \n"
  puts "Date : #{@date}/#{@month}/#{@year} \n"
  sum = 0
  
  #old version
  #~ Range.new(0,@name.length).each do|n|
    #~ #puts "char at #{n} = #{@name[n]}"
    #~ #print @name[n]
   #~ case @name[n]
    #~ when ?A , ?J , ?I , ?Y , ?Q then sum = sum + 1
    #~ when ?B , ?K , ?R then sum = sum + 2
    #~ when ?S , ?C, ?L, ?G then sum = sum +3
    #~ when ?T, ?D, ?M then sum = sum +4
    #~ when ?E, ?N, ?X, ?H then sum = sum + 5
    #~ when ?U, ?V, ?W then sum = sum + 6
    #~ when ?O, ?Z then sum = sum + 7
    #~ when ?F, ?P then sum = sum +8
   #~ end
   #~ while sum > 9
    #~ sum = sum_digits(sum)   
   #~ end 
  #~ end
  
  #replace the chararcters with thier numberic equivalent
  #map contains key value pairs - A : 1, B : 2....
  #replace each char (key in map) in the string with the value from the map 
  $map.each do |k,v|
   @name.gsub!(k, v.to_s)
  end
  
  #find the sum of digits until the sum is single digit
  sum = @name.to_i
  while sum > 9
   sum = sum_digits(sum)
  end
  
  #calculate sum value for date of birth
  dateSum = @date + @month + @year
  while dateSum > 9
   dateSum = sum_digits(dateSum)   
  end

  print "Name value :#{sum}\n"
  print "Date value :#{dateSum}\n"

 end

 private 
 #sum the digits of the given number
 def sum_digits(num)
  sum = 0
  quotient = num
  while quotient > 0
   #puts "sum : #{sum}, reminder: #{reminder}, quotient: #{quotient}"
   reminder = quotient % 10
   quotient = quotient / 10
   sum = sum + reminder 
  end
  return sum 
 end
end


if __FILE__ == $0
    begin 
 num = Numerology.new(ARGV[0],ARGV[1],ARGV[2],ARGV[3])
 num.calculate
    rescue => ex
 puts "Error : #{ex.message}"
    end
end