Which of the following is not a unit of time?

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(B) light-year is a unit of astronomical distance,not time. It is defined as the distance that light travels in a vacuum in one Julian year,which is a

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Light year

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(B) light-year is a unit of astronomical distance,not time. It is defined as the distance that light travels in a vacuum in one Julian year,which is approximately $9.4607 	imes 10^{12} \ km$.Lunar month,leap year,and microsecond are all units used to measure time intervals.Therefore,the correct option is $B$.

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