According to Kepler, the period of revolution of a planet $(T)$ and its mean distance from the sun $(r)$ are related by the equation
${T^3}{r^3} = $ constant
${T^2}{r^{ - 3}} = $ constant
$T{r^3} = $ constant
${T^2}r = $ constant
According to Kepler, the period of revolution of a planet $(T)$ and its mean distance from the sun $(r)$ are related by the equation
$\frac{{{T^2}}}{{{r^3}}} = $ constant
$ \Rightarrow \,{T^2}{r^{ - 3}}$= constant
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