Elliptical Orbit

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\documentclass[border=2pt]{standalone}
% Drawing
\usepackage{tikz}
% Tikz Library
\usetikzlibrary{calc}
% Newcommand
%% Midline Label
\newcommand{\midlinelabel}[3]{
   \node (midlabel) at ($ (#1)!.5!(#2) $) {#3};
   \draw[stealth-] (#1) --  (midlabel);
   \draw[-stealth] (midlabel) -- (#2);
}
%
\newcommand{\midlinelabell}[3]{
   \node[fill = white, inner sep = 0.2pt, outer sep=3pt] (midlabel) at ($ (#1)!.5!(#2) $) {#3};
   \draw[stealth-] (#1) --  (midlabel);
   \draw[-stealth] (midlabel) -- (#2);
}
\begin{document}
    
    \begin{tikzpicture}
        %Grid
%       \draw[thin, dotted] (0,0) grid (8,8);
%       \foreach \i in {1,...,8}
%       {
%           \node at (\i,-2ex) {\i};    
%       }
%       \foreach \i in {1,...,8}
%       {
%           \node at (-2ex,\i) {\i};    
%       }
%       \node at (-2ex,-2ex) {0};
        
        % Axis
        \draw[-latex, thick] (5,0) -- (5,8) node[left] {$y$};
        \draw[-latex, thick] (0,4) -- (9,4) node[below] {$x$};
 
 
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Elliptical-Orbit