circleearth=arc((0,0), 1, 1, sector=(0,2*pi), color="red", axes_labels=['ua','Orbita circular'])
elipseearth=arc((0,0), 1, 0.9999986, sector=(0,2*pi), color="green", axes_labels=['ua','Orbita eliptica+circular'])
show(circleearth,elipseearth,circleearth+elipseearth)
