Why a Week Has Seven Days
Written by Studio AM.
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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.
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Questions
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Question 1 of 4
What is the main idea of the passage?
The answer is A: The seven-day week developed through human traditions, including ideas about the sky.
The passage describes several traditions and explains that a week is not one complete Earth or Moon cycle.
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Question 2 of 4
Which seven lights were linked with one ancient naming tradition?
The answer is C: The Sun, the Moon, and five visible planets.
The second paragraph lists the Sun, Moon, and five planets visible without a telescope.
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Question 3 of 4
In this passage, "fixed" stars are stars that
The answer is B: keep the same position relative to each other
Fixed stars form a background whose relative positions appear stable while the Sun, Moon, and planets move across it.
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Question 4 of 4
The passage suggests that English day names differ from French ones because
The answer is D: some peoples swapped the Roman gods for gods of their own
The passage says some English day names use northern European gods in place of Roman ones.
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