tropical month

noun

Definition of tropical month 

: a period that equals the mean time of the moon's revolution from any point of the ecliptic back to the same point and amounts to 27 days, 7 hours, 43 minutes, and 4.7 seconds of mean solar time

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First Known Use of tropical month

1869, in the meaning defined above

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The first known use of tropical month was in 1869

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