\begin{table}%t1
\caption{\label{summary}Effects which need to be taken into account to achieve photospheric accuracies on the solar disk ranging from 1$''$ down to 0{\farcs}001, as seen by an
observer at 1~AU.}
%\centering
\par
\begin{tabular}{ll}
\hline\hline\noalign{\smallskip}
Accuracy	& Effects\\
\hline
${>}1''$& Perspective\\
& Parallax near L1\\
& Refraction/scattering (radio)\\
& \\
${>}0{\farcs}1$& Parallax for geostationary satellites\\
& \\
${>}0{\farcs}01$& Speed-of-light (planetary aberration)\\
& Terrestrial parallax\\
& Perspective between L1 and Earth\\
& \\
${>}0{\farcs}001$	& Spherical projection\\
& Optical axis determination\\
& Solar radius uncertainties\\
& Gravitational deflection\\
\hline
\end{tabular}
\end{table}