HORIZON

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HORIZON

            [ASTRO\]HORIZON  h1  h2 ... [/AIRMASS] [/SOURCE ... ] [/PLANET ... ]
        [/FLUX Fmin Fmax] [/NIGHT_MARKS] [/ALTERNATE] [/PROJECT] [/ELEVATION]

        This command is used to produce plots of LST  ranges  of  observability,
        above specified elevations, of sources and planets. An OBSERVATORY and a
        TIME must have been selected. The LST axis is drawn on the bottom of the
        plot,  and UTC on the top . An horizontal line is drawn for the time pe-
        riod during which the object(s) is(are) visible above elevation h1; tick
        marks  and  labels are provided for elevations h1, h2, ... (in degrees),
        or corresponding air masses values  (with  /AIRMASS  option).  Elevation
        values must be in increasing order, or airmasses in decreasing order.

        Various options are available to control the plot:
            /SOURCE                  will plot all sources
                                     of the current (by default) or alternate
                                     (if /ALTERNATE is used) catalog.
            /SOURCE name1 name2 ...  will be restricted to the specified sources
                                     (sources are searched for in memory
                                     (after SOURCE command) or in the current
                                     catalog)
            /SOURCE NEXT n           will plot the next n sources in the current
                                     catalog (repeat this command to avoid over-
                                     crowded pages)
            /ALTERNATE               with /SOURCE, will use the Alternate catalog
            /FLUX Fmin Fmax          restrict the search to sources with flux in
                                     the specified range.

            /PLANET                  will plot on one page all solar-system bodies
            /PLANET name1 name2 ...  will be restricted to the specified bodies

            /NIGHT_MARKS             Plots also the beginning and end of astronomica
                                     nautical and civil twilights, and an estimate o
                                     the moon phase and the moon bolometric magnitud

        For  specific  Plateau de Bure scheduling purposes, the options /PROJECT
        and /ELEVATION can be used to further restrict the search of the sources
        in  the  catalog. In that case, the source catalog must have a number of
        additional parameters available for each source (project name,  frequen-
        cy, priority, minimal elavation,...).