Julian Day

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\documentclass[border=3pt]{standalone}
%Tikz
\usepackage{tikz}
\usetikzlibrary{calc, angles, quotes}
\def\radius{1.2cm}
\begin{document}
    \begin{tikzpicture}[line cap=round, line join=round]
%       %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};
        
        %Coordinates
        \coordinate (sun) at (1.5,3);
        \coordinate (earth) at ($(sun)+(120:\radius)$);
        \coordinate (binary system) at (7,3);
        
        %Orbit
        \draw (sun) circle (\radius);
        
        %Lines
        \draw[dashed] (earth) -- (sun) -- (binary system);
        
        %Bodies
        \draw[inner color = yellow, outer color = orange, draw = orange] (sun) circle (4pt);
        \draw[left color = green, right color = blue, draw=white] (earth) circle (2pt);
        \draw[inner color = orange, outer color = red, draw=red, rotate=90] (binary system) ellipse (3.5pt and 2pt);
        
        %Angles
        \pic[draw, "$\theta$", angle eccentricity=1.8, angle radius=0.3cm] {angle = binary system--sun--earth};
        
 
 
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