in slavic languages, some of the names correspond to numerals after sunday: compare russian "vtornik" ("вторник") "tuesday" and "vtoroj" ("второй") "the second", "chetverg" ("четверг") "thursday" and "chetvjortyj" ("четвёртый") "the fourth", "pyatnitsa" ("пятница") "friday" and "pyatyj" ("пятый") "the fifth"; see also the notes.