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Timekeeping (day length): The length of a civil day is determined in which terms? Focus on how the 24-hour day is defined for calendars and clocks. Choose the correct option.

Difficulty: Easy

Astronomical units
Solar terms
Length of the hours
None of the above

Correct Answer: Solar terms

Explanation:

Concept/Approach
An astronomical unit (AU) measures distance (Earth–Sun). A solar day is based on the apparent motion of the Sun—i.e., solar terms. “Length of the hours” is derivative, not the defining standard; hours are subdivided from the solar day.

Final Answer
Solar terms

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