\begin{table}%t2
%\centering
\par
\caption{Harmonic development of lunar ephemeris LE-405/406 over 3000BC--3000AD (simplified solution LEA-406b).
\label{Table2}}
\begin{tabular}{l l l l } % centered columns (4 columns)
\hline\hline % inserts double horizontal lines
\noalign{\smallskip}
Coor- & Minimum & Number & Maximum error over \\ % table heading
dinate & amplitude & of terms & 3000BC--3000AD \\
\hline % inserts single horizontal line
\noalign{\smallskip}
$r$ & 1 m & 1996 & \quad 0.20 km \\
$V$ & 0\farcs 00055 & 3770 & \quad 0\farcs 42  \\
$U$ & 0\farcs 00055 & 2186 & \quad 0\farcs 33  \\
\noalign{\smallskip}
\hline % inserts single horizontal line
\end{tabular} 
\end{table}