Of the following, which has Earth completed when it makes one revolution around the Sun?

Rationale

One Earth year is completed when Earth makes one revolution around the Sun.

The duration of one complete revolution of the Earth around the Sun defines an Earth year, which is approximately 365.25 days. This period is the basis for our calendar year and reflects the time it takes for Earth to orbit the Sun once.

A (One Earth year) CORRECT

This choice accurately describes the time it takes for Earth to complete one full revolution around the Sun, which constitutes an Earth year. The definition aligns with the astronomical and calendrical measurements that govern our understanding of time in relation to Earth's orbit.

B (One Earth day) YOUR ANSWER

An Earth day refers to the time it takes for Earth to complete one full rotation on its axis, which is about 24 hours. This measure is unrelated to the Earth's orbit around the Sun and thus does not represent the duration of a revolution.

C (One light year) YOUR ANSWER

A light year is a measure of distance, specifically the distance that light travels in one year, which is approximately 5.88 trillion miles. It is not a unit of time related to Earth's revolution around the Sun, making this choice incorrect in the context of the question.

D (One lunar month) YOUR ANSWER

One lunar month, or a lunar cycle, represents the time it takes for the Moon to complete its phases, averaging about 29.5 days. This period is based on the Moon's orbit around the Earth and does not correspond to the time it takes for Earth to orbit the Sun.

Conclusion

In summary, an Earth year is defined by the time it takes Earth to complete one revolution around the Sun, approximately 365.25 days. Other options like an Earth day, light year, and lunar month refer to different measurements of time or distance, making them unsuitable answers in the context of the question. Understanding these definitions is crucial for grasping the relationship between Earth's motion and our timekeeping systems.

Of the following, which has Earth completed when it makes one revolution around the Sun?

One Earth year is completed when Earth makes one revolution around the Sun.

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