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.