terminal heights of the meteors, the descending nodes of both showers as a function of the solar longitude, and the narrow Southworth-Hawkins D-criterion for most December Monocerotids and November Orionids with respect to the parent comet ($D_{SH}<0.15$). Direct modeling of the stream was not an option, while the orbit uncertainty of the comet avoids the selection of reliable and real starting point of the numerical integration from the past to the current date. Therefore, we studied the orbital evolution of the nominal orbit of the comet, cometary clones within the known orbital uncertainties, and the orbital evolution of precise meteor orbits. The dispersion of the orbital elements, the radiants and nominal orbit of the parent comet, currently beyond the orbital elements, suggest that the November Orionids is an older stream than December Monocerotids. The orbital evolution of both streams, the nominal orbit of the comet and its clones imply that the orbital evolution is causing November Orionids to have 10$^\circ$ lower inclinations than December Monocerotids. There is a non-zero chance of a close encounter of the comet with Venus or Mercury which could cause a sudden change in the inclination of the parent comet. Furthermore, a close encounter with a 