\begin{table}%t2
\caption{\label{t:signs}Numbers $Z$ replacing the zodiacal signs in the machine-readable longitudes.}
%\centering
$$
\begin{tabular}{rcrcrcrcrcrc}
\hline\hline \noalign{\smallskip}
1 & \aries  &  3 & \gemini & 5 & \leo   & 7 & \libra & 9 & \sagittarius & 11 
 & \aquarius \\
\hline
2 & \taurus &  4 & \cancer & 6 & \virgo & 8 & \scorpio & 10 & \capricornus
 & 12 & \pisces \\
\hline
\end{tabular}
$$
\end{table}