Projections of typical meteoroid orbits from Groups 1 and 2 (left) and 3 and 4 (right) into the ecliptic plane. The parts of orbits above ecliptic are shown by thick line. The orbits of planets Mercury to Jupiter are drawn in black. The Earth’s orbit is thicker. Vernal equinox is to the right. All planets and meteoroids move counterclockwise. Note the different positions of nodes relative to aphelion in Groups 2–4.