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    Semimajor Axis

    Description

    Kepler's third law states that the square of the orbital period of a planet is directly proportional to the cube of the semimajor axis of its orbit.

    Alternate name

    harmonic law

    History

    formulation date | 1619 (405 years ago) formulator | Johannes Kepler

    Associated equation

    T^2∝a^3

    Limitations

    Agrees well with experiments for classical mechanics, but may require more sophisticated formulations such as special relativity, general relativity, or relativistic quantum mechanics for small scales, large speeds, or strong gravitational fields.

    Classes

    Kepler's laws | laws of physics

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