Measured by the lab
39.47187
Does a planet's orbital period really go as the 3/2 power of its orbit size?
▶ Run the simulationSee the measured result
Units: dimensionless (μT²/a³ = 4π²; companion known exponent p = 3/2; secondary knowns: sidereal year 365.25636 d, AU 1.495978707e11 m)
Place planets on circular orbits at several radii, time each period, and plot T² against a³.
Kepler's third law — a shared constant T²/a³ = 4π²/μ