Language

                        ASTRO\ Language summary

    ATMOSPHERE          : compute atmospheric parameters
    CATALOG             : opens a standard source or line catalog
    CONVERT             : precess coordinates from an input catalog
    CONSTELL            : draws constellation on current plot
    FRAME               : define plotting reference system
    HORIZON             : plot observability hours of sources and planets
    HEADER              : write time parameters on top of plot
    OBSERVATORY         : define current observatory
    PLANET              : compute planet coordinates
    SET parameter value : enter some parameter value
    SHOW                : display variable defined with SET, OBSERVATORY, and TI
    SOURCE              : compute source coordinates and velocities
    TIME                : set computation time
    UV_TRACKS          : plot interferometer UV tracks