Question 1165485
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                For the author of this post education.

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If the orbit is a real ellipse,  different from a circle,  then the distance from the focus to the point at the ellipse 

<U>VARIES</U> &nbsp;and has a &nbsp;<U>VARIABLE &nbsp;magnitude</U>.



If the distance from the point to the orbiting object has a constant value, &nbsp;then the orbit is a circle.



So, &nbsp;you, &nbsp;the author, &nbsp;learn the terms first, &nbsp;BEFORE &nbsp;trying to create &nbsp;(to compose) &nbsp;your own &nbsp;Math problem, &nbsp;and use then the terms properly.