\begin{table}%t2
%\centering
\par
\caption{The long-period terms in VSOP87:
$At^\alpha\cos (\omega t+\phi)$. The planetary and lunar arguments
are $T =\rm  Earth$, $Ma =\rm  Mars$, $J = \rm Jupiter$, $S = \rm Saturn$, $D$ =
Delaunay's argument D (the difference of the mean longitudes of
Moon and Sun), $L_{\rm Moon} =\rm  mean$ longitude of the Moon.\label{tab2}}
\begin{tabular}{lcccc}
\hline\hline
Argument &$\alpha$ &$A$ ($''$) &$\phi$ (degree) & $P=2\pi/\omega$
(year)\\
\hline
Variable: $q$ & & & & \\
$2J-5S$                         & 0 & 0.00672 & 125.2 &  883 \\
$4T-8Ma+3J$             & 0 & 0.00012 & 350.4 & 1783 \\
$2J-5S$                         & 1 & 0.00050 & 174.6 &  883 \\
$T+D-L_{\rm Moon}$& 1 & 0.00017 & 180.0 &25~770 \\
\hline
Variable: $p$ & & & & \\
$2J-5S$                         & 0 & 0.00757 &  30.4 &  883 \\
$2J-5S$                         & 1 & 0.00030 & 114.6 &  883 \\
$T+D-L_{\rm Moon}$& 1 & 0.00017 & 270.0 &25~770 \\
\hline
\end{tabular}
\end{table}