#include "colors.inc"

camera {
       location <0,8,-20>
       look_at <0,0,-5>
       }
       
light_source { <-100, 100, -100> color Gray90 }
                  
#declare my_sphere = 
sphere {
        <0.0, 0.0, 0.0>, .3
        texture {
                pigment {
                        color rgb <0, .2, 1>
                        }
                }
        }                  

#declare r_d = 180/pi;
#declare theta = 0;
#macro earth_orbit (theta)
        
        #while (theta < 360)
                
        #local distance1 = (1 - pow(0.01671,2)) / (1 + 0.01671 * cos(theta - (1.7968*r_d)));
        
        object {
                my_sphere          
                translate <9*distance1, 0, 0>
		rotate y*theta
                }
        
        #declare theta = theta + 5;
        #end //end of while 
        
#end
        


#declare theta = 0;
#macro asteroid_orbit (theta)
        
        #while (theta < 360)
                
        #local distance1 = (0.937 * (1 - pow(0.232,2)) ) / (1 + (0.232 * cos(theta - (5.22*r_d))));
        
        object {
                my_sphere
		texture { pigment { color rgb <.8, .8 , .8> } }
                translate <9*distance1, 0, 0>
		rotate y*theta
                }
        
        #declare theta = theta + 5;
        #end //end of while 
        
#end

earth_orbit (0)
asteroid_orbit(0)