OBSERVATORY

        [ASTRO\]OBSERVATORY longitude latitude altitude radius
                 or
        [ASTRO\]OBSERVATORY Name

    Specify an  observatory  whose  coordinates  are  known,  or  Enter  the
    observatory geographic coordinates in degrees, and elevation in km above
    sea level. CAUTION: East longitudes are positive.  The  fourth  argument
    is   the  radius  of  the  Sun  avoidance  circle,  in  degrees.   Known
    observatories are  "BURE",  "VELETA",  "LASILLA",  "SEST",  "MAUNA_KEA",
    "JCMT",  "CSO",  "VLA",  "KITT_PEAK",  "EFFELSBERG",  "PARANAL"  (or its
    equivalent "VLT").

    Example:  OBSERVATORY 44:23:12.0  +45:09:57.9 3.987 30.

    A reasonable  system  default  should  be  introduced  in  command  file
    "GAG_UTIL:ASTRO_LOCAL.ASTRO".    For   "PARANAL"/"VLT",   the   variable
    FREQUENCY is changed to 300 THz, i.e, a reasonable 1  micron  value  for
    the VISA interferometer.