The following commands will plot the position of the observability hours for sources on on January 1st, 1990, together with planet Venus:
CATALOG SAMPLE ! First define the catalog OBSERVATORY VELETA ! and the observatory TIME 03:00 01-JAN-1990 ! the time and date HORIZON /SOURCE /PLANET VENUS
The output will look like Figure 2.
![\begin{figure}% latex2html id marker 235\epsffile{noelh.ps}
\caption[NOELH]
{\smallPlotting an observability chart \par }
\end{figure}](img4.gif)