How can we relate mathematically the time interval in which a planet is in retrograde motion and the devided distances from the sun of the planets ?(adsbygoogle = window.adsbygoogle || []).push({});

My first drawing was this:

Where S is thee sun , P is the planet, T si the Earth. The v's are the corespondent speeds

If we take a look at it we can say that:

r x cos(lambda)= ap x cos(labda2) - ao x cos(lambda1) , same for sine

What next?

Oh, and gamma is the vernal point

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# Planetary retrograde motion

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