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1. Planets in the orbits all conform to Kepler's three laws of planetary motion, 2. The orbits are all nearly in the same plane,

3. The orbits are all elliptical, but not very ellptical and near-circular in shape, with the Sun slightly off-centre.

Added:

p2 = a3

P. The planetary orbital period in earth years.

a. Distance from sun in astronomical units, based on 1 AU for earth. ( for example, Mars would be about 1.5 AU and you would use this value in the equation, not the actual distance )

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