Rankine Scale:

The Kelvin scale is not the only one which exists for defining absolute temperature, though it is by far the most generally used. The other scale, known as the Rankine scale (°R), also allocates the value zero to the coldest possible temperature. The dissimilarity is that the Rankine degree is accurately 5/9 as large as the Kelvin degree. In contrary, the Kelvin degree is accurately 9/5, or 1.8 times, the size of the Rankine degree.

A temperature of 50 K is equal of 90°R; a temperature of 360°R is the equivalent of 200 K. To transform any reading in °R to its equivalent in K, multiply by 5/9. In opposition, to convert any reading in K to its equivalent in °R, multiply by 9 /5, or exactly 1.8.

The difference between the Kelvin and the Rankine scales is important at tremendous readings. When you hear someone say that a star's core has a temperature of 30 million °R, they are talking about the equivalent of around 16.7 million K. Though, you are not likely to hear anyone use Rankine numbers.