Why a Week Has Seven Days

Written by Studio AM.

A day follows the Earth's rotation. A year follows its journey around the Sun. Months were developed from the Moon's changing phases, although modern calendar months do not all match that cycle.

The seven-day week has a more complicated history. It is not one complete cycle of the Earth or Moon. Several ancient traditions helped it develop, and historians do not agree on one simple origin. One tradition linked the days to seven moving lights in the sky: the Sun, the Moon, and five planets visible without a telescope. They appeared to move against a background of fixed stars.

The seven-day cycle spread through different cultures and became common in the Roman world. Some day names still show the link with the sky. Sunday refers to the Sun, and Monday to the Moon. Some English names use gods from northern Europe in place of Roman gods.

A week is useful because people share it. Its history includes astronomy, religion, and human choices, rather than one event in nature that happens every seven days.

Questions

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  1. Question 1 of 4

    What is the main idea of the passage?

  2. Question 2 of 4

    Which seven lights were linked with one ancient naming tradition?

  3. Question 3 of 4

    In this passage, "fixed" stars are stars that

  4. Question 4 of 4

    The passage suggests that English day names differ from French ones because

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