OBSERVATORY

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

    Specify an observatory by giving its geographic coordinates in  degrees,
    and  elevation in km above sea level. Caution: east longitudes are posi-
    tive.  The fourth argument is the radius of the Sun avoidance circle, in
    degrees (default is 30 degrees).

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

    A  number  of observatories are pre-defined and can be selected directly
    be typing "OBSERVATORY Name". Type "OBSERVATORY ?" for the list of known
    telescopes.

    Without  argument,  the  observatory name is translated from the GAG_AS-
    TRO_OBS logical name.

    For NOEMA, PDBI, PICO, and ALMA, a version can  be  added  as  argument.
    This  can  be used to select the instrument capabilities, as done by SE-
    LECT PDBI|ALMA command in the past.

    For NOEMA, there is only one year possible for the time being (2017). In
    ASTRO,  the  switch to NOEMA observatory name has been placed at the de-
    livery of the NOEMA backend polyfix.

    For PDBI (observatory can be PDBI or BURE),  a  year  must  be  entered:
    1995,  2000,  2006, 2010, 2013, or 2015. They correspond to the upgrades
    of the receiver system (1995, 2006, and  2015)  and  of  the  correlator
    (2000, 2010, 2013).

    For  PICO,  the  year  can  be 2016 or 2021. 2021 takes into account the
    change in frequency coverage in 2021 (outer baseband  folding  frequency
    changed)

    For ALMA, the cycle number must be entered (0, 1, ...). Any number larg-
    er than the current cycle is equivalent to "OBSERVATORY ALMA  FULL"  and
    points to the full ALMA capabilities.

    For  NOEMA, PDBI, ALMA, and 30m,  OBSERVATORY also enables some specific
    commands to define and visualize receiver  and  backend  configurations.
    These  commands are gathered together in the dedicated languages NOEMA\,
    PDBI\, PICO\ and ALMA\ (see e.g. HELP NOEMA\ for the list  of  available
    commands).