Fahrenheit is a thermodynamic temperature scale, where the freezing point of water is 32 degrees Fahrenheit (°F) and the boiling point 212°F (at standard atmospheric pressure). This puts the boiling and freezing points of water exactly 180 degrees apart. Therefore, a degree on the Fahrenheit scale is 1/180 of the interval between the freezing point and the boiling point of water. Absolute zero is defined as -459.67°F.
A temperature difference of 1°F is the equivalent of a temperature difference 0.556°C.
Based upon the definitions of the Centigrade scale and the experimental evidence that absolute zero is -273.15ºC