\begin{table}
\caption{Observed and calculated data of the Geminid meteors.}
%\centering
\par
\label{tab1}
\begin {tabular}{l|llllllllllllll}
\hline
\hline
{\it N}      &Year,   &Day &$\alpha_{\rm R}$ &$\delta_{\rm R}$ &$\cos~z_{\rm R}$ &$V_\infty$ &$h_{\rm b}$  &$h_{\max}$  &$h_{\rm e}$  &$ h_0$  &$M_{\max}$ &$t$   &$m_\infty$   &$r_\infty$  \\
       &month   & UT   &deg      & deg       &           &km~s$^{-1}$       &km    &km        &km           &km    &mag        &s   &g          &cm            \\
\hline
643881 &64 Dec. &14.022 &113.1  &32.4   &0.80       &34.5       &94.2  &60.8      &53.0  & 90.1    &$-3.5$       &1.55 &11.62     &0.98   \\
761683 &76 Dec. &15.699 &113.3  &32.1   &0.58       &34.4       &87.2  &61.4      &59.8  & 90.9    &$-5.7$       &1.38 &19.50     &1.20   \\
821691 &82 Dec. &13.992 &119.1  &33.7   &0.93       &39.9       &92.7  &64.8      &51.3  & 91.2    &$-4.6$       &1.19 &10.04     &0.94   \\
\hline
\par
\end{tabular}
\par
\end{table}