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Validating · validations

Kepler orbits simulation

Does a planet's orbital period really go as the 3/2 power of its orbit size?

▶ Run the simulationSee the measured result

Measured by the lab
39.47187
Known value
39.478418
Relative error
-1.66e-4

Units: dimensionless (μT²/a³ = 4π²; companion known exponent p = 3/2; secondary knowns: sidereal year 365.25636 d, AU 1.495978707e11 m)

How the lab tests it

Place planets on circular orbits at several radii, time each period, and plot T² against a³.

What it checks

Kepler's third law — a shared constant T²/a³ = 4π²/μ