Dermott's law
Dermott's law is an empirical formula for the orbital period of major satellites orbiting planets in the Solar System. It was identified by the celestial mechanics researcher Stanley Dermott in the 1960s and takes the form: T ( n ) = T ( 0 ) ⋅ C {\displaystyle T(n)=T(0)\cdot C} n {\displaystyle ^{n}} for n = 1 , 2 , 3 , 4 … {\displaystyle n=1,2,3,4\ldots } Where T(n) is the orbital period of the nth satellite, T(0) is of the order of days and C is a constant of the satellite system in question.