<Tr> <Th> Day </Th> <Th> Monday </Th> <Th> Tuesday </Th> <Th> Wednesday </Th> <Th> Thursday </Th> <Th> Friday </Th> <Th> Saturday </Th> <Th> Sunday </Th> </Tr> <Tr> <Th> Standard Chinese </Th> <Td> 星期 一 Xīngqīyī </Td> <Td> 星期二 Xīngqí'èr </Td> <Td> 星期三 Xīngqīsān </Td> <Td> 星期四 Xīngqīsì </Td> <Td> 星期五 Xīngqīwǔ </Td> <Td> 星期六 Xīngqīliù </Td> <Td> 星期日 Xīngqīrì </Td> </Tr> <P> In Swahili, the day begins at sunrise rather than sunset, and so are offset by twelve hours from the Arabic and Hebrew calendar . Saturday is therefore the first day of the week, as it is the day that includes the first night of the week in Arabic . </P> <P> Etymologically speaking, Swahili has two "fifth" days . The words for Saturday through Wednesday contain the Bantu - derived Swahili words for "one" through "five". The word for Thursday, Alhamisi, is of Arabic origin and means "the fifth" (day). The word for Friday, Ijumaa, is also Arabic and means (day of) "gathering" for the Friday noon prayers in Islam . </P>

Who decided the names of the days of the week