// Author: John Bowman.
size(6cm,0);
import solids;

revolution r=sphere(O,1);
r.fill(lightgrey);

skeleton s;
r.transverse(s,reltime(r.g,0.6));
r.longitudinal(s);
draw(s.back,linetype("8 8",8));
draw(s.front);

r.transverse(s,reltime(r.g,0.5));
r.longitudinal(s);
draw(s.back,linetype("8 8",8));
draw(s.front);