finding is consistent with the radar data, where NOO are more significant than MON (@nil64, @sek73).

We determined the maximum activity of the MON for the longitude of the Sun $L_{\odot}=259.5$$^\circ$ (December 11) with the duration of the shower from November 26 to December 21. The maximum of MON occurs one day earlier in the SonotaCo data than in the IAU MDC catalogue. The radiant position during the maximum activity was determined as $RA=98.8$$^\circ$, $DEC=8.6$$^\circ$ and the daily motion is given by the following equations in the equatoreal and ecliptical coordinates:

$$\begin{array}{l}
 \displaystyle RA=(101.4\pm0.1)\,^\circ + (0.65\pm0.01)~(L_{\odot}-259.5\,^\circ)\\
 \displaystyle DC=(~8.0\pm0.1)\,^\circ ~~ - (0.14\pm0.02)~(L_{\odot}-259.5\,^\circ)\\
\end{array}
\label{eq:xdef}$$

$$\begin{array}{l}
 \displaystyle \lambda=(101.7\pm0.1)~+(0.67\pm0.01)~(L_{\odot}-259.5\,^\circ)\\
 \displaystyle \beta=(-14.9\pm0.1)-(0.09\pm0.01)~(L_{\odot}-259.5\,^\circ),\\
\end{array}
\label{eq:xdef}$$

where 259.5$^\circ$ represents the solar longitude of the December Monocerotid’s maximum, derived from the SonotaCo data (eq.2000.0).

According to SonotaCo data, the maximum activity of the NOO occurs on $L_{\odot}=249.5$$^\circ$ (December 1) and it is active from November 16 until December 16. The maximum occurrs 4 days after the maximum predicted by the IAU MDC catalogue ($L_{\odot}=245.0$$^\circ$). The motion of the radiant is given by equations (3) and (4):

$$\begin{array}{l}
\displaystyle RA=(92.6\pm0.2)\,^\circ + (0.62\pm0.03)~(L_{\odot}-249.5\,^\circ)\\
 \displaystyle DC=(15.3\pm0.1)\,^\circ - (0.06\pm0.02)~(L_{\odot}-249.5\,^\circ)\\
\end{array}
\label{eq:xdef}$$

$$\begin{array}{l}
 \displaystyle \lambda=(92.5\pm0.1)\,^\circ ~+ (0.60\pm0.02)~(L_{\odot}-249.5\,^\circ)\\
 \displaystyle \beta=(-8.1\pm0.1)\,^\circ - (0.06\pm0.02)~(L_{\odot}-249.5\,^\circ).\\
\end{array}
