Dienstag aus Licht Dienstag aus Licht Dienstag aus Licht (Tuesday from Light) is an opera by Karlheinz Stockhausen in a greeting and two acts, with a farewell, and was the fourth of seven to be completed for the opera cycle "Licht: die sieben Tage der Woche" (Light: The Seven Days of the Week). It was begun in 1977 and completed from 1988 to 1991, to a libretto by the composer. "Dienstag" is an opera for 17 solo performers (three singers, 10 instrumentalists, 4 dancer-mimes), actors, mimes, choir, orchestra, and electronic music. Tuesday is the red day of conflict between Michael and Lucifer .
Names of the days of the week Sun and Moon ("sunnudagur" and "mánudagur" respectively), while dispensing with the names of the explicitly heathen gods in favour of a combination of numbered days and days whose names are linked to pious or domestic routine ("föstudagur", "Fasting Day" and "laugardagur", "Washing Day"). The "washing day" is also used in other North Germanic languages, but otherwise the names correspond to those of English. The ISO prescribes Monday as the first day of the week with ISO-8601 for software date formats. The Slavic, Baltic and Uralic languages (except Finnish and partially Estonian) adopted numbering but took Monday rather than Sunday as