code: def refract(alt_degrees, temperature_C, pressure_mbar):
      
      alt = alt_degrees
      while True:
          alt1 = alt
          alt = alt_degrees + refraction(alt, temperature_C, pressure_mbar)
          converged = abs(alt - alt1) <= 3.0e-5
          if converged.all():
              break
      return alt
docs: Given an unrefracted `alt` determine where it will appear in the sky.