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2013-09-26 09:39:15
2013-09-26 09:39:15

The mass of the Sun and the distance between the planet and Sun.

As the Sun's mass is (more or less) constant, all we need to know is the distance. Technically this is called the "semi major axis" of the elliptical orbit.

(If you wanted to be really, really accurate the mass of the planet does have a

very very small effect.)

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