Wednesday, March 9, 2016

tan180 and atan180


  The orbit calculation in the last blog used some nonstandard tangent and inverse tangent functions defined on the interval [0,π] or [0°,180°]. They reduce the conversion of the eccentric anomaly to the true anomaly to a single step and simplify the definition of the true anomaly, θ(t).



Both definitions are one-to-one as the following check shows.


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