I just looked in the Septuagint and (I guess unsurprisingly) it uses ἡμέρα μία, ἡμέρα δευτέρα, ἡμέρα τρίτη. So it wasn't literally directly in the translation p

I just looked in the Septuagint and (I guess unsurprisingly) it uses ἡμέρα μία, ἡμέρα δευτέρα, ἡμέρα τρίτη. So it wasn't literally directly in the translation process. One could also say that the Genesis text is counting days rather than naming them, as Genesis 1:5 for says יוֹם אֶחָד ('one day') whereas the "name" of the day in Hebrew is יוֹם רִאשׁוֹן ('first day'). This author argues that the "the Jewish, biblical week and the planetary week of astrological origin" were combined in Rome rather than Greece, while agreeing that there are earlier antecedents for the use of the seven-day week. https://blogs.fu-berlin.de/zodiacblog/2022/05/02/the-origins-of-the-planetary-week/ https://blogs.fu-berlin.de/zodiacblog/2022/05/02/the-origins... Wikipedia on "nundinae" seems to roughly agree with this interpretation: > The 7-day week first came into use in Italy during the early imperial period. For a time, both systems were used together, but the nundinae are seldom mentioned in extant sources after the Julio-Claudian period. The nundinal cycle had probably fallen out of use by the time Constantine adopted the Hebrew weeks for official use in AD 321, altering the day of rest by declaring the Lord's day the Day of the Sun (dies Solis) a legal holiday. Different scholars have placed the end of 8-day markets at various dates from the late 1st to early 5th centuries.