Relative Time Dilation

time.rb

#
# http://en.wikipedia.org/wiki/Time_dilation
#

C = 300000.0
SECONDS_IN_YEAR = 365 * 24 * 3600

def calculate(v, delta_t)
  relative_v = ( v * v ) / ( C * C )
  denominator = Math.sqrt( 1 - relative_v ).to_f
  numerator = delta_t.to_f
  numerator / denominator
end

def output(*args)
  result = calculate(*args)

  %Q[
Travel in space at speed of #{ args[0].to_f  } m/s
for #{ ( args[1] / SECONDS_IN_YEAR ).to_f } years
the relative time dilation would be #{ ( result / SECONDS_IN_YEAR ) } years.
  ]
end

args = [ ( 1 / 3.0 ) * C, 20 * SECONDS_IN_YEAR ] # 1/3 C for 20 years

puts output(*args)