Names of the days of the week - Wikipedia
https://en.wikipedia.org/wiki/Names_of_the_days_of_the_week
WEBThe days were named after the classical planets of Hellenistic astrology, in the order: Sun ( Helios ), Moon ( Selene ), Mars ( Ares ), Mercury ( Hermes ), Jupiter ( Zeus ), Venus ( Aphrodite ), and Saturn ( Cronus ). [6] The seven-day week spread throughout the Roman Empire in late antiquity.
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