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Through Week, Friday and Hour

The day's name was introduced into West Germanic languages, and is recorded in the Low German languages such as Middle Low German satersdach, saterdach, Middle Dutch saterdag (Modern Dutch zaterdag), and Old English Sæternesdæġ, Sæterndæġ or Sæterdæġ.

Origins

The seven-day week originated in Judaism, with the seventh day observed as a Sabbath day. Via the influence of Christianity, the seven-day week was adopted by the Roman Empire, gradually replacing the eight-day Roman nundinal cycle between the 1st and 3rd centuries AD. The astrological order of the days was explained by Vettius Valens and Dio Cassius. Chaucer gave the same explanation in his Treatise on the Astrolabe. According to these authors, it was a principle of astrology that the heavenly bodies presided, in succession, over the hours of the day. The association of the weekdays with the respective deities is thus indirect, the days are named for the planets, which were named for the deities.

The Germanic peoples adapted the system introduced by the Romans and placed their indigenous gods over the Roman deities in a process known as interpretatio germanica. In the case of Saturday, however, the Roman name was borrowed directly by West Germanic peoples, apparently because none of the Germanic gods was considered to be a counterpart of the Roman god Saturn. Otherwise Old Norse and Old High German did not borrow the name of the Roman god (Icelandic laugardagur, German Samstag).

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