In a vast number of languages, the names given to the seven days of the week are derived from the names of the seven classical planets which were in turn named after contemporary Hellenistic deities.
Italian cameo bracelet representing the days of the week, corresponding to the planets as Roman gods: Diana as the Moon for Monday, Mars for Tuesday, Mercury for Wednesday, Jupiter for Thursday, Venus for Friday, Saturn for Saturday, and Apollo as the Sun for Sunday. Middle 19th century, Walters Art Museum
Marine sandglass MMM
Nundinae
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The nundinae, sometimes anglicized to nundines, were the market days of the ancient Roman calendar, forming a kind of weekend including, for a certain period, rest from work for the ruling class.
Names of the days of the week
…deities of the regional culture. The seven-day week was adopted in early Christianity from the Hebrew calendar, and gradually replaced the Roman internundinum. Eight-day and seven-day weeks existed side-by-side until the Emperor Constantine made the seven-day week official in AD 321; thereafter, the seven-day…
A fragment of the Fasti Praenestini for the month of Aprilis, showing its nundinal letters on the left side
The full remains of the Fasti Praenestini
A section of the remains of the Fasti Praenestini