SET OBSERVATORY

        LAS\SET OBSERVATORY *
        LAS\SET OBSERVATORY Name
        LAS\SET OBSERVATORY Name Longitude Latitude Altitude

    If OBSERVATORY is *, Class will guess the observatory from the telescope
    name (R%HEAD%GEN%TELES). This is the default.

    If an observatory name known by GILDAS/Astro is provided as first  argu-
    ment,  Class  will use the known longitude, latitude and altitude values
    independently of the telescope name.

    If an observatory name is provided with its explicit longitude, latitude
    (both  sexagesimal strings) and altitude (in kilometers), Class will use
    those values independently of the telescope name.

    The two last syntaxes are useful for R%HEAD%GEN%TELES  strings  encoding
    observatories unknown by Class.