Darwin (unit)

The Darwin, named after the British naturalist Charles Darwin is a unit that is used in evolutionary research. It was defined by J. B. S. Haldane in 1949.

Defines the Darwin as a change of a feature by a factor of e ( approximately 2.718 ) over the period of 1 million years.

Equation

The equation for the calculation of the evolutionary change ( ) is:

Where and start and end values ​​of the characteristics and the change of time in millions of years. An alternate form of the equation:

Since the difference between two natural logarithms is a dimensionless ratio, the characteristic can be measured in any unit. For this reason, the Darwin a special form of inverse mega - annum ().