... 's law is also known as the harmonic law, and can also be written in the form Where n is the mean motion of an orbiting body, a its semimajor axis, G the gravitational constant, and M the mass. If a is measured is astronomical units, T is measured in years (so that is measured in y-1, and the central mass is the sun (so that , i.e., the ... solar mass), then Kepler's law takes the extremely simple form (http://scienceworld.wolfram.com/physics/KeplersThirdLaw.html) (http://javalab.uoregon.edu/dcaley/kepler/Kepler.html) Another influenceal person in Astronomy was ... ...

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