Convert from degree Rankine to degree Fahrenheit

Unit Definition (degree Rankine)
The degree Rankine is a traditional unit of absolute temperature. 1 °Rankine represents the same temperature difference as 1 °Fahrenheit, but the zero point of the scale is set at absolute zero. This means the Rankine temperature is 459.67° plus the Fahrenheit temperature. 1 °Rankine is equal to exactly 5/9 kelvin. The unit is named for the British physicist and engineer William Rankine (1820-1872).

Unit Definition (degree Fahrenheit)
Degrees Fahrenheit is a common unit of temperature still widely used today. The unit was defined by the German physicist Daniel Fahrenheit. Fahrenheit set 0° at the coldest temperature he could conveniently achieve using an ice and salt mixture, and it is said he intended to set 96°F as the temperature of the human body. On his scale, the freezing point of water (at 1atm.) turned out to be ~32°F and the boiling point ~212°F. Eventually the scale was precisely defined by these two temperatures.